Cannot boot PC after installing new power supply and graphics card.

boat

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May 25, 2014
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I own a HP Pavilion p6-2170a. Today I decided it was finally time to purchase a new graphics card. I bought a GTX 660 (non-ti) along with a Cougar RS 650W Power Supply Unit. I watched a few YouTube clips and read the manual, after installing it correctly (hopefully), I turn on the power switch at the back, then the PC itself, all going well so far, then the blue light turns to orange and flashes while letting out a beeping noise. Then after leaving it for about thirty seconds, it resumes like normal. Goes to the HP logo boot screen (press ESC for startup menu) and stays like that for about three minutes and then sends all my monitors into standby. It stays like that until I turn it off.

Please help, I'm afraid that I've killed my computer. Thanks in advance!