I wanted to post my recent experience with the ASUS motherboard 680i and increasing the ram from 2 to 4 gig because alot of the help i got was a little old so i thought i would try and help update some of the things i found regarding this problem.
I upgraded the ram in my Vista Ultimate 32 bit system to 4 gigs of ram from 2 but i was disapointed to find my system suffered the black screen +no bios when i restarted for the first time after the new 2 gigs were installed. I immediatly googled for similiar troubled souls and realized i wasnt alone .
So im happy to say with help from the "old posts" i managed to fix things and im happily running 4 gigs. What i did was
#!: Removed the battery to wash the CMOS , i waited about 30 minutes before i put the battery back in , but while i waited i put the 2 new sticks of Kingston HYPER ram KHX6400D2LLK2/2GN in the remaining slots (4 sticks total).
#2 hooked everything back up , i turned on the monitor then the PC power and held down Esc to enter the bios with the hope it started ..."it did"
#3 Then i followed the manual instructions:2-21Make sure you reenter your bios settings after you clear the CMOS ! So press enter "setup" hit the F5 key then F10 - yes and then start vista OS.
Reset the clock/date/yr did a couple updates and to make sure everything was cool i ran the windows "grade yr pc" (i scored 5.0 i then ran the can you run this ? on the nvidia sight and was happy to see everything passed > Crysis=NO PROBLEM . Fired up my fav game BF2 and it ran like a dream. Hope this helps if you run into the same problem.