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Computer wont boot with 5770 (P5K SE mobo)

Last response: in Graphics & Displays
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March 27, 2010 6:55:51 AM

Hey,

Just bought a Sapphire Radeon HD 5770 1 gig today, and after replacing my 8800 GTS with it, my computer wont boot (long beep followed by 3 short beeps).
If I put my old video card in, it will work fine.

System specs:
Intel Dual core E6550 @2.33 Ghz
P5K SE mobo
2x 1 gig Corsair DDR 2
Windows XP SP 3
PSU: CoolerMaster RP-650-PCAR 650W ATX12V
Yes, I did plug the 6pin from the PSU to the 5770.

Just did a BIOS update with ASUS updater to 1104 (latest) and still doesnt work.
Any idea what I could do next?
March 27, 2010 7:16:54 AM

Ok I just cleared the CMOS (removing the battery from mobo and changing the jumper position for a few mins etc...) and that worked!!!! ....kinda... now my PC boot, and windows starts but after a few seconds (30 sec max; sometimes I dont even get a chance to see my desktop) my computer reboot itself everytime :<

I haven't changed the BIOS settings since I flashed my BIOS with the latest one so there might be something wrong there? I have no idea though as I have never modified BIOS settings myself before.
March 27, 2010 10:42:53 AM

driver sweeper in safe mode did the trick!! there was some nvidia leftover drivers lurking around. seems stable so far (only tried 30mins but that s 30 more mins than before :)  ).
!