Hello I just replaced my motherboard with an Aopen vk8t800a-lf, when it boots up checksum error loading defaults comes up. press delete to enter setup or f1 to continue. when I continue the windows logo comes on then the computer shuts down. If I turn it back on it wont boot up nothing comes on the screen. I have to reset the cmos jumper to get it to that point again. I have tried changing the cmos battery but didn't HELP. I rechecked all CONNECTIONS etc. What should I try NEXT.Was the replacement CMOS battery new ? ?
Try another one...

If you enter setup and rstore factory defaults and press F10 to "save changes and EXIT" does it hold the changes ? ?
Is the date and time correct ?Tried antother battery , its good it was tested. The settings hold when saved.Did you try removing and re-seating the RAM ? ?yes tried that and no change
Flakey PSU then would be my next guess.This may help you find what's causing CMOS error http://www.datarecoverytools.co.uk/2009/07/15/how-to-solve-cmos-checksum-error-defaults-loaded/Interesting site...mentions everything i suggested.I tried a different psu one I know is good, and also updated BIOS but no change yet. I am going to check out that web site now.Now the computer keeps rebooting in a continuous loop when the logo comes up it reboots and so on each time.Where is this 2nd PSU from ?
Is the wattage the same or greater than what was in there ?

When replacing the MBoard was thermal paste applied and all MBoard standoffs used ?Quote from: Dwayne Austin on November 27, 2011, 12:12:34 PM

f1 to continue. when I continue the windows logo comes on then the computer shuts down. If I turn it back on it wont boot up nothing comes on the screen.

I did try to reinstall windows before the BIOS update but that didn't work , I tried again after the update now all is good.