Maybe not the keyboard in particular but the USB bus in general. The fact that it's apparently happening to USB and video at the same time does make it seem like some kind of motherboard bus voltage....thing.
I guess you could also try playing with advanced power options in windows. Disable things like USB selective suspend. I wouldn't think that should be a problem, especially in a desktop, especially with these symptoms but at least it's an easy thing to try -- just setting all power options to always on all the time no matter what.
Diggles may have some more ideas but my temptation would be to order a new power supply, try that and last resort a new motherboard. Pretty big pain in the ass, though. Just doesn't seem like a software problem, or like something that could be related to memory or disk drives (unless, again, they are somehow causing a power problem).
If you replaced a 2004 video card I'm guessing a lot of your other components could be pushing up there in age too.
(This is why I'm contemplating a gaming laptop myself. Most of my components are from 2012-2013. 6 years is actually getting up there for a full time gaming rig.)
I guess you could also try playing with advanced power options in windows. Disable things like USB selective suspend. I wouldn't think that should be a problem, especially in a desktop, especially with these symptoms but at least it's an easy thing to try -- just setting all power options to always on all the time no matter what.
Diggles may have some more ideas but my temptation would be to order a new power supply, try that and last resort a new motherboard. Pretty big pain in the ass, though. Just doesn't seem like a software problem, or like something that could be related to memory or disk drives (unless, again, they are somehow causing a power problem).
If you replaced a 2004 video card I'm guessing a lot of your other components could be pushing up there in age too.
(This is why I'm contemplating a gaming laptop myself. Most of my components are from 2012-2013. 6 years is actually getting up there for a full time gaming rig.)