|"There have been absolutely no problems till about 2 months ago,..."|
What happened 2 months ago at about that time ?
Was there a power failure event that might have produced power spikes or power surges?
A nearby lightning strike ?
Had you been fiddling with the video card inside the case ?
Had you been fiddling with anything inside the case ?
Did you clean the inside of the case at about that time ?
If so, did you use a vacuum cleaner ?
Were there any static electricity discharges to the computer ?
Did you change settings in the bios BEFORE that happened ?
Did you REMOVE the AC power to the case at ALL times when you were fiddling with the video card or any connection inside the case ?
Apparently there is a
Assuming you have a plain M2N68-AM model, there are 4 English manuals listed for it,
so there are probably as many as 4 versions of the mboard.
Which Exxxx version is shown in the beginning of the manual for your mboard ?
I downloaded and looked in one of those manuals.
In the Bios Setup
Primary Graphics Adapter
Default: PCI-E > PCI > IGP
or IGP > PCI > PCI-E
IGP = Integrated Graphics Processor = the onboard video
There is NO SETTING in the bios that can disable the onboard video.
Installing a PCI-E X16 card in the PCI-E X16 slot auto disables the onboard video, if the card is detected properly.
Installing a PCI video card probably does NOT auto disable the onboard video.
All the Primary Graphics Adapter setting does is inform the operating system which type of graphics adapter you're using.
If that's set wrong, you still have video in Windows 2000 and up, but when the setting is wrong the advanced features of the card that the specific video drivers allow for won't work properly in Windows .
Since the graphics card works fine on other computers....
- the card may have had a poor connection in it's slot.
Did you check it to make sure it was all the way down in it's slot ?
Did you try removing the card from it's slot and re-installing it ?
- the bios settings may be otherwise wrong for the card.
Apparently you can overclock the PCI-E bus setting in the bios in the Advanced settings. If you're doing that, don't do that, or back off on that. Bios defaults do not overclock that. Video cards often don't work when their bus speed is overclocked more than a tiny bit.
- the circuits of the slot you had the card plugged into may have been damaged, by an external event that wasn't your fault, or by something you did. In that case, no video card will work properly in that slot.
Some mboards develop this problem - electrolytic capacitors were installed on them that were not properly made, and they fail eventually - the mboard manufacturer didn't know they were improperly made at the time the mboard was made.
Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .
This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:
What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
Pictures of blown capacitors, other components, power supplies, fried Athlon cpus, etc.: