I have a problem where my pc will freeze up then the screen will go blank for a sec or two then come back. It can go weeks w/o happening then one day it will occur every other minute or so. This has happened with two diff monitors and two diff video cards. I have the most recent video driver. Could it be a MOBO driver?

Athlon 64 4000+ 2.4GHz
1.5GB Dual Channel PC3200
XFX GeForce 6600GT PCI-E

Lots of things can make a computer freeze - most of the time it's caused by software problems, less often data corruption, but it can be caused by hardware problems too. It is extremely unlikely that would be caused by mboard drivers unless they are corrupted.
It is easy to re-load them if you think that might be the case.

emachines computers have a reputation for using power supplies that are much more likely than average to become defective and eventually fail. If the PS on an emachines computer does fail, it is much more likely than average to damage the mboard or something else connected to it.
Your symptoms could very well be related to that.
Check your PS.
See response 4 in this:
http://www.computing.net/hardware/w...

dead or failing emachines computers
See response 1 in this:
http://www.computing.net/windowsxp/...

check your hard drive.
See the latter part of response 1 in this:
http://www.computing.net/windows95/...

See response 2 in this - try cleaning the contacts on the ram modules.
http://www.computing.net/hardware/w...
If you do a ram test, such as with memtest86, do it after cleaning the ram contacts.

Forgot to mention I have a Thermaltake 430W PSU that I got about a year ago. I've had where my PC just locks up and either have to reboot or it comes back after a min, just like a lot of other people I'm sure, but I've never heard of the monitor actually turn black(it's still on, just goes black). And I have new ram, but it also did it with the old ram as well. I've ran scandisk and defrag and had no errors. I guess ill try reinstalling the motherboard drivers.

Athlon 64 4000+ 2.4GHz
1.5GB Dual Channel PC3200
XFX GeForce 6600GT PCI-E

Let me correct myself...The monitor power indicator goes from BLUE to YELLOW during the freeze up, like it would if it's on standby.

Athlon 64 4000+ 2.4GHz
1.5GB Dual Channel PC3200
XFX GeForce 6600GT PCI-E

"The monitor power indicator goes from BLUE to YELLOW during the freeze up, like it would if it's on standby."

It isn't receiving a video signal during that time - that may or may not be be normal for that monitor. Black screening is not a normal situation for a freeze - that's almost always caused by a hardware problem.

Did you replace the PS before the original one started to fail, or after it started to fail, or after the original one died?
Have you had these freezes ever since replacing the power supply, or is this a more recent problem?

Thermaltake are better than average, but you should still check the voltages in the bios Setup screens - see the first link in response 1.

Something may be overheating.
Remove the power to your case. Make sure the cpu fan is clean, and the heatsink fan is clean, especially underneath the cpu fan (you may need to remove the fan).
If you have a chipset fan on the mboard, or a chipset fan on a video card, make sure they are clean.
Restore power to the case. Make sure the cpu fan is spinning. If you have a chipset fan on the mboard, or a chipset fan on a video card, make sure they are spinning. If any of the fans make any rattling or screeching sounds - that's more likely to show up when the computer is started up after the computer has cooled to room temp - they must be replaced. A cpu fan must be replaced as soon as you can.

Do the last two things in response 1, if you haven't already.

If the hard drive passes there are more things to try.