I've poked around the net trying to find something that might shed some light on this, but so far I've come up empty. Even ATI's support site seems to have nothing on it.
I'm still running on the Catalyst 6.4's (namely because I've had no reason to update them and there's no problems with anything), though the other week I decided to slot the new 6.12's on as a periodic update rather than essential.
This has highlighted a problem - after removing the old drivers completely, including checking the registry to see if there was any traces left, I installed 6.12 normally and restarted. Now the PC will boot up normally, but it when it reaches the point to load the windows desktop, the screen goes black. I can hear windows start-up sound playing, but the monitor just displays a "no signal" message and then powers down into standby mode. The same thing appears to br happening with every version from 6.7 onwards. I haven't tried 6.5 or 6.6.
Using Safe mode and system restore I rolled backwards to 6.4 again and all is normal. I didn't notice anything unusual in safe mode towards settings. It's almost as if with the different drivers that the card is "forgetting" to switch on. I considered a BIOS problem, but I don't believe there's any updates that would account for such an error and failing there being a stray setting I have to enable that's required for later drivers, I'm sort of at a total loss by this stage. I just find it a bit unusual that suddenly later revisions don't work.
The full system specs are:
AMD Athlon 64 X2 4800+
Corsair 2GB DDR XMS3200C2PT TwinX
Sapphire ATI Radeon X1900XT-X 512MB Crossfire ready
Asus A8R-MVP Crossfire motherboard
Samsung spinpoint 250G S-ATA II hard drive
Asus 16X DVD-ROM
Hitachi DVD-RAM
Windows XP Home (SP 2)
I'm still running on the Catalyst 6.4's (namely because I've had no reason to update them and there's no problems with anything), though the other week I decided to slot the new 6.12's on as a periodic update rather than essential.
This has highlighted a problem - after removing the old drivers completely, including checking the registry to see if there was any traces left, I installed 6.12 normally and restarted. Now the PC will boot up normally, but it when it reaches the point to load the windows desktop, the screen goes black. I can hear windows start-up sound playing, but the monitor just displays a "no signal" message and then powers down into standby mode. The same thing appears to br happening with every version from 6.7 onwards. I haven't tried 6.5 or 6.6.
Using Safe mode and system restore I rolled backwards to 6.4 again and all is normal. I didn't notice anything unusual in safe mode towards settings. It's almost as if with the different drivers that the card is "forgetting" to switch on. I considered a BIOS problem, but I don't believe there's any updates that would account for such an error and failing there being a stray setting I have to enable that's required for later drivers, I'm sort of at a total loss by this stage. I just find it a bit unusual that suddenly later revisions don't work.
The full system specs are:
AMD Athlon 64 X2 4800+
Corsair 2GB DDR XMS3200C2PT TwinX
Sapphire ATI Radeon X1900XT-X 512MB Crossfire ready
Asus A8R-MVP Crossfire motherboard
Samsung spinpoint 250G S-ATA II hard drive
Asus 16X DVD-ROM
Hitachi DVD-RAM
Windows XP Home (SP 2)
.....but then looking at your spec you don't got none 
