Windows 7 welcome screen displays glitched graphic and freezes.

After getting a corsair cx600w modular psu to swap out my old one since my gtx 660 was overpowering it, after installation it booted up fine untill i tried to log in, a very glitchy screen, very pixelated pink background with green squares everywhere, suddenly was displayed, and as expected the gpu was at fault ( i prooved this as the motherboard chipset was working fine when i plugged it in). What happened? Even after trying again with the old psu the result was still the same: the pink background with green squares. I hope i don't need to replace my gpu.
**Edit**
I Forgot to mention that i can only go onto safe mode with the gtx 660 that i have. I tested my old gpu, a gt 610, everything worked perfectly fine. that confirmed that there was nothing wrong with the pci slot.
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More about windows screen displays glitched graphic freezes
  1. have you reseated your gpu?? if you did check for dirt in the pci slot and damage on your gpu.
  2. smorizio said:
    have you reseated your gpu?? if you did check for dirt in the pci slot and damage on your gpu.

    I checked for dirt on the slot, there was none, and as far as i can tell, the gpu has nothing damaged and/or out of place. Even the an old gt 610 that i had in the past worked perfectly when i replaced the new gpu with the old one today.
  3. if the 610 is working fine then looks like some ram or the gpu chip went bad on the new gpu.
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