Exhibit 10.76

AMENDMENT NO. 4 TO

LOAN AND SECURITY AGREEMENT

THIS AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT (this “Amendment”) is entered into this 23rd day of March, 2012, by and among SILICON VALLEY BANK, a California banking corporation (“Bank”), U.S. AUTO PARTS NETWORK, INC., a Delaware corporation (“USAPN”), AUTOMOTIVE SPECIALTY ACCESSORIES AND PARTS, INC., a Delaware corporation (“ASAP”), GO FIDO, INC., a Delaware corporation (“Go Fido”), PARTS BIN, INC., a Delaware corporation (“Parts Bin”), LOBO MARKETING, INC., a Texas corporation (“Lobo”), WHITNEY AUTOMOTIVE GROUP, INC., a Delaware corporation (“Whitney”), PRIVATE LABEL PARTS, INC., a Delaware corporation (“Private Label”), PACIFIC 3PL, INC., a Delaware corporation (“Pacific”), AUTOMD, INC., a Delaware corporation (“AutoMD”), and LOCAL BODY SHOPS, INC., a Delaware corporation (“Local Body Shops” and with USAPN, ASAP, Go Fido, Parts Bin, Lobo, Whitney, Private Label, Pacific, and AutoMD, each a “Borrower” and collectively, the “Borrower”). Capitalized terms used herein without definition shall have the same meanings given them in the Loan Agreement (as defined below).

RECITALS

A. Borrower and Bank entered into that certain Loan and Security Agreement dated as of August 13, 2010, as amended by that certain Amendment No. 1 to Loan and Security Agreement and Limited Waiver dated as of February 28, 2011, as amended by that certain Amendment No. 2 to Loan and Security Agreement and Limited Waiver dated as of November 7, 2011, as amended by that certain Amendment No. 3 to Loan and Security Agreement dated as of December 29, 2011 (as amended, restated, or otherwise modified from time to time, the “Loan Agreement”), pursuant to which the Bank agreed to extend and make available to Borrower certain advances of money.

B. Borrower desires that Bank amend the Loan Agreement upon the terms and conditions more fully set forth herein.

C. Subject to the representations and warranties of Borrower herein and upon the terms and conditions set forth in this Amendment, Bank is willing to so amend the Loan Agreement.

AGREEMENT

NOW, THEREFORE, in consideration of the foregoing Recitals and intending to be legally bound, the parties hereto agree as follows:

1. AMENDMENT TO LOAN AGREEMENT.

1.1 Section 6.7 (Financial Covenants). Subsection (c) of Section 6.7 of the Loan Agreement is amended and restated in its entirety as follows:

“(c) Consolidated Fixed Charge Coverage Ratio. A Consolidated Fixed Charge Coverage Ratio, measured as of the last day of each fiscal quarter, for the period set forth below of not less than the ratio set forth below opposite such period:

Notwithstanding the forgoing, the covenants in this Section 6.7 are subject to adjustment should the Initial Audit reveal material adverse derivations in Borrower’s financial position as compared to Borrower’s financial position based on information provided to Bank on or before the Effective Date.”

1.2 Exhibit D (Compliance Certificate). Exhibit D to the Loan Agreement is amended and restated in its entirety and replaced with Exhibit A hereto.

2. BORROWER’S REPRESENTATIONS AND WARRANTIES. Borrower represents and warrants that:

(a) immediately upon giving effect to this Amendment (i) the representations and warranties contained in the Loan Documents are true, accurate and complete in all material respects as of the date hereof (except to the extent such representations and warranties relate to an earlier date, in which case they are true and correct in all material respects as of such date), and (ii) no Event of Default has occurred and is continuing;

(b) Borrower has the corporate power and authority to execute and deliver this Amendment and to perform its obligations under the Loan Agreement, as amended by this Amendment;

(c) the certificate of incorporation, bylaws and other organizational documents of Borrower delivered to Bank on the Effective Date remain true, accurate and complete and have not been amended, supplemented or restated and are and continue to be in full force and effect;

(d) the execution and delivery by Borrower of this Amendment and the performance by Borrower of its obligations under the Loan Agreement, as amended by this Amendment, have been duly authorized by all necessary corporate action on the part of Borrower;

(e) this Amendment has been duly executed and delivered by Borrower and is the binding obligation of Borrower, enforceable against it in accordance with its terms, except as such enforceability may be limited by bankruptcy, insolvency, reorganization, liquidation, moratorium or other similar laws of general application and equitable principles relating to or affecting creditors’ rights; and

(f) as of the date hereof, Borrower has no defenses against the obligations to pay any amounts under the Obligations. Borrower acknowledges that Bank has acted in good faith and

has conducted in a commercially reasonable manner its relationships with Borrower in connection with this Amendment and in connection with the Loan Documents.

Borrower understands and acknowledges that Bank is entering into this Amendment in reliance upon, and in partial consideration for, the above representations and warranties, and agrees that such reliance is reasonable and appropriate.

3. LIMITATION. The amendments set forth in Section 1 of this Amendment shall be limited precisely as written and shall not be deemed (a) to be a waiver of, or consent under, any term or condition of any instrument or agreement, (b) to be a modification of any other term or condition of the Loan Agreement or of any other instrument or agreement, (c) to prejudice any right or remedy which Bank may now have or may have in the future under or in connection with the Loan Agreement, the other Loan Documents or any other instrument or agreement or (d) to be a consent to any future amendment, modification, or waiver to any instrument or agreement. Except as expressly amended hereby, the Loan Agreement shall continue in full force and effect.

4. EFFECTIVENESS. This Amendment shall become effective upon (i) the due execution and delivery of this Amendment by each party hereto and delivery of same to Bank and (ii) payment by Borrower of an amendment fee in the amount equal to $50,000.

5. EXPENSES. Borrower agrees to pay Bank Expenses (including the fees and expenses of Bank’s counsel, advisors and consultants) accrued and incurred in connection with the transactions contemplated by this Amendment and all other Bank Expenses (including the fees and expenses of Bank’s counsel, advisors and consultants) payable in accordance with the Loan Agreement.

6. COUNTERPARTS. This Amendment may be signed in any number of counterparts, and by different parties hereto in separate counterparts, with the same effect as if the signatures to each such counterpart were upon a single instrument. All counterparts shall be deemed an original of this Amendment.

7. INTEGRATION. This Amendment and any documents executed in connection herewith or pursuant hereto contain the entire agreement between the parties with respect to the subject matter hereof and supersede all prior agreements, understandings, offers and negotiations, oral or written, with respect thereto and no extrinsic evidence whatsoever may be introduced in any judicial or arbitration proceeding, if any, involving this Amendment; except that any financing statements or other agreements or instruments filed by Bank with respect to Borrower shall remain in full force and effect.

8. GOVERNING LAW; VENUE. THIS AMENDMENT SHALL BE GOVERNED BY AND SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF CALIFORNIA. Borrower and Bank each submit to the exclusive jurisdiction of the State and Federal courts in Santa Clara County, California.

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IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be executed as of the date first written above.

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Amendment No. 4 to

Loan and Security Agreement

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Amendment No. 4 to

Loan and Security Agreement

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Amendment No. 4 to

Loan and Security Agreement

EXHIBIT D

COMPLIANCE CERTIFICATE

The undersigned authorized officer of U.S. AUTO PARTS NETWORK, INC. (“Administrative Borrower”) certifies that under the terms and conditions of the Loan and Security Agreement between Administrative Borrower, AUTOMOTIVE SPECIALTY ACCESSORIES AND PARTS, INC. (“ASAP”), GO FIDO, INC. (“Go Fido”), PARTS BIN, INC. (“Parts Bin”), LOBO MARKETING, INC. (“Lobo”), WHITNEY AUTOMOTIVE GROUP, INC. (“Whitney”), PRIVATE LABEL PARTS, INC. (“Private Label”), PACIFIC 3PL, INC. (“Pacific”), AUTOMD, INC. (“AutoMD”) and LOCAL BODY SHOPS, INC. (“Local Body Shops”, and with Administrative Borrower, ASAP, Go Fido, Parts Bin Lobo, Whitney, Private Label, Pacific and AutoMD, each a “Borrower” and collectively, the “Borrower”) and Bank (the “Agreement”):

(1) Each Borrower is in complete compliance for the period ending _______________ with all required covenants except as noted below; (2) there are no Events of Default, except as noted below; (3) all representations and warranties in the Agreement are true and correct in all material respects on this date except as noted below; provided, however, that such materiality qualifier shall not be applicable to any representations and warranties that already are qualified or modified by materiality in the text thereof; and provided, further that those representations and warranties expressly referring to a specific date shall be true, accurate and complete in all material respects as of such date; (4) Each Borrower, and each of its Subsidiaries, have timely filed, or have obtained extensions for filing, all required tax returns and reports, and each Borrower has timely paid all foreign, federal, state and local taxes, assessments, deposits and contributions owed by each Borrower except as otherwise permitted pursuant to the terms of Section 5.8 of the Agreement; and (5) no Liens have been levied or claims made against any Borrower or any of its Subsidiaries relating to unpaid employee payroll or benefits of which Borrower has not previously provided written notification to Bank.

Attached are the required documents supporting the certification. The undersigned certifies that these are prepared in accordance with GAAP consistently applied from one period to the next except as explained in an accompanying letter or footnotes. The undersigned acknowledges that no borrowings may be requested at any time or date of determination that Borrower is not in compliance with any of the terms of the Agreement, and that compliance is determined not just at the date this certificate is delivered. Capitalized terms used but not otherwise defined herein shall have the meanings given them in the Agreement.

Please indicate compliance status by circling Yes/No under “Complies” column.

The following financial covenant analys[is][es] and information set forth in Schedule 1 attached hereto are true and accurate as of the date of this Certificate.

The following are the exceptions with respect to the certification above: (If no exceptions exist, state “No exceptions to note.”)

Schedule 1 to Compliance Certificate

Financial Covenants of Borrower

In the event of a conflict between this Schedule and the Loan Agreement, the terms of the Loan Agreement shall govern.

Dated: ____________________

Required:    See chart below

Actual:

Is line I equal to or greater than                 :1.00?