Hi - I hope some one can help me with this problem. i'm sure its easy enough to figure out... Okay, I took the power supply out of my pc and then put it back in (was just testing another PC) . When i booted up the pc the monitor was playing up so i messed around with the graphics card and sorted the problem. however before doing this i removed the Cmos jumper setting and now it laods but only gets to the start up screen where it gives you a lsit of the drives and then says... CMOS checksum error - defaults loaded. Press F1 to continue or Delete to enter setp However, wehn i press F1 notthing happens. My cpu fan slows down/stops also when i boot the machine up. I dont know why its doing this, maybe the ram or the fact that it was overclocked has stoped it from booting up properly. If anyone can help that would be so very much appriciated. My Spec is as follows AMD 64 3000 winchester Dfi lanparty Ultra NF4 Sli Maxtor 160 8Mb Cashe 7200 Rpm 1024 MB pc3200 6600 GT It was overclocked to 2.7Ghz so maybe removing the Cmos was a bad idea? Thanks for any help you may be able to offer Aaron

you answered your own question. the checksum error is because the bios is now back to the default setting since you reset it and you had it overclocked. you need to reimplement all of the fsb/cpu multiplier settings you had prior to resetting the bios.

Okay - if i cant get into the bioa though then how do I do that? Is there a way fo resetting everything or no?

will it help if i remove everything inc the battery and Cmos jumper and then fit everything back in...

Wait, let me ask somehting that I may have missed. You said that you removed the cmos jumper, you did put it back on didnt you?

Yes! lol

Unplug the power cord, move the ClearCMOS jumper to the Clear position momentarily, then move it back to the Normal position. Plug in the power, bootup, hit DEL, then correct ALL the BIOS settings.... ASUS A7N8X-X Athlon XP 1800+ 8.5 x 200MHz 1024MB PC3200 2.5-3-3-7 Asus A9550GE/TD 128MB WinME/WinXP Pro SP1