Topic Title: White dots in BIOS
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Created On: 08/11/2012 12:27 PM
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 08/11/2012 12:27 PM
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radeon4850 HD

after some BSODs were caused by the catalyst file (atikpmag.sys) i started to have symmetric formation white dots in random BIOS loading parts (startup) and i can`t launch the windows(7 x64)  in ragular mode without deleting this file in safemode, so i have to chose between a working windows and videodriver. is the problem in the videocard or the ware? how can i check or fix it?

 08/13/2012 12:38 PM
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It sounds to me as though you are pretty well getting "display corruption." It is happening in the BIOS, which is before Windows loads.  Therefore the issue is hardware related, and not drivers or software.

Nearly always, I find the video card is at fault.  Can you swap out the video card to rule it out?



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 08/13/2012 01:13 PM
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Yeah, hardware issue if problem is in BIOS screen ..

Two things to test first :

HD4850's fan/heatsink assembly. If it's never been cleaned, you can take it out and make sure it's not an overheating issue due to dust build-up in the fan/heatsink fins .. If it's out of warranty and you're able to do this yourself, then you could also check the thermal paste situation and maybe replace the TIM ( as the stuff does sometimes cake solid or dissipates over time ).

PSU check too : make sure voltages @ 12v are within spec.

If card has been cleaned and PSU is still OK etc, then you could always bribe a buddy with a few beers and see if somebody will let you test it in a secondary rig .. ( assuming their system has an adequate PSU to power the card ) ..


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