UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

(Amendment No. 1)

(Mark One)

For the quarterly period ended June 30, 2011

or

For the Transition Period from                      to                     

Commission File No. 001-34052

DayStar Technologies, Inc.

(Exact name of registrant as specified in its charter)

(408) 582-7100

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to filing requirements for the past 90 days.     Yes   x     No   ¨

Indicate by checkmark whether the registrant has submitted electronically and posted on its corporate Web-site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     Yes   x     No   ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     Yes   ¨     No   x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

EXPLANATORY NOTE

This Amendment No. 1 on Form 10-Q/A (this “Amendment No. 1”) amends the Quarterly Report on Form 10-Q of DayStar Technologies, Inc. (the “Company”) for the quarterly period ended June 30, 2011, as originally filed with the Securities and Exchange Commission (the “SEC”) on August 15, 2011 (the “Original 10-Q”).

The Company is filing this Amendment No. 1 pursuant to Rule 405(a)(2) of Regulation S-T to submit its first Interactive Data File within the 30-day grace period permitted thereunder. The sole purpose of this Amendment No. 1 is to include the Interactive Data File pursuant to Rule 405(a)(2) (submitted as Exhibit 101 hereto).

This Amendment No. 1 contains a cover page, this explanatory note, an amended exhibits index, a signature page, and Exhibit 101.

Except as expressly set forth herein and as described in this Explanatory Note, no other changes are being made to the Original 10-Q. This Amendment No. 1 speaks as of the filing date of the Original 10-Q and does not reflect events occurring after the filing of the Original 10-Q, nor does it modify, amend, restate, or update the disclosures or information set forth in the Company’s Original 10-Q in any way other than as described in this Explanatory Note. Accordingly, this Amendment No. 1 should be read in conjunction with the Original 10-Q as well as the Company’s other filings and reports filed with the SEC.

PART II. OTHER INFORMATION

Item 6. Exhibits

(a) The following exhibits are filed as part of this report:

SIGNATURES

In accordance with the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.