4870x2 crashes fullscreen, plays in window mode.

[dougal4chaos]

my system is 3 1/2 years old.
asus p5q pro
q9550
radeon 4870x2

at xmas i was playing skyrim full screen no problem.
in march i found that ALL my games crashed in full screen mode yet all those i could start windowed would work while in window mode.

i updated bios, chipset and graphic drivers, but games would still crash full screen.

i was runnign xp home so did a clean install of win 7 x64, installed graphics drivers and only 1 game - guild wars.

same thing, game works in window mode but as soon as you full screen it crashes and pc locks up.

i searched google and found lots of other people with exactly the same problem but no solutions that work.

what else can i do ? is it a graphic card problem or maybe a power supply issue ?

 

[dougal4chaos]

Windowed mode cannot use Crossfire.

What is your PSU?

corsair HX1000w

 

[dougal4chaos]

cpu is q9550

and i dont have crossfire, i just have the one 4870x2

 

[dougal4chaos]

also no ive never overclocked anything.

ok i thought crossfire ment having 2 4870x2 's

on the Graphics Card Hierarchy Chart my card is on teir 4 so is already a pretty good card, its on the same level as the gtx 570

i read a few years ago you should try and jump 2 or 3 tiers when you upgrade a card so if thats still true id be looking at the gtx 680

 

[dougal4chaos]

ive seen gtx 680 for 400 quid

so is my card definatly physicaly broken in someway ?

 

[dougal4chaos]

no i dont have spare psu or graphics test to test with.

is there any software that can test the psu ?

 

[dougal4chaos]

i dont see 12v in GPU-z. it has

VDDC 1.2625 V
VDDC current 28.5 A

and

VDDC 1.0625 V
VDDC current 16.9 A

in CPUID PRO it has 11.77 volts

 

[dougal4chaos]

i read that psu can be +-5% so i should be ok there