8790 Destroying Own Drivers?

My 8790 has been artifacting on and off for the past month or so and I have obtained an RMA but have needed the unit for school work so have been babying it along (no games, video for short periods of time, shutting it down every chance I can) when finally it artifacted worse then before, as in the entire screen got covered in little red squares that did not go away (the other artifacting was more of blurring of the screen and just pixels but this was a distinct pattern of many pixels that had no relevance to the screen display) after immediatly restart the computer windows failed to be displayed. The boot screens came up and the windows xp loading screen came up but once into windows nothing but a black (not blank BLACK) screen appeared, the screen was on but not getting and display but was not off) I had had this problem many months ago when I got the motherboard replaced and somehow the VBIOS and BIOS did not match up and I had to use a program to force the refresh rate to 75 hz to solve the problem (no thanks to tech support they just kept telling me the screen could not use 75 hz and only 60 hz even though as I was on the phone with them I chagned from 60 *black screen, to 75 *see everythign fine, but they woudl not believe me or help me by sending the VBIOS) I tried this same program at 75 and 60 hz to no avail. I also booted in safemode which worked and used ati driver cleaner and installed the newest omega drivers and the same problem exists.

Any help on the problem would be very helpful as I am currently using the cheapest laptop I coudl buy on ebay to tranistion to for when I send my 8790 in for repair. Thank you.

It definitly is at 75 hz I batteled the sytems for many hours and finally got some sort of solution to work, although if I reboot I have to refix it so would hardly call it fixed. And mine originally was at 60 hz, sent in for mobo replacement they patched some sodder etc. etc. and it only works on 75 hz, no idea why or how that is possible but it is undeniably true unless the system is mistaken as what is says its working at (i.e. have not tested it with an outside device) I think it might have to do with the VBIOS but no one seems to be able to give me an updated version so will have to deal with it. It will be interesting to see what it wlil be at after my next RMA.