How long did it work before it started having problems?
Would you characterize the games that crash as being particularly graphics intensive?
Sounds a whole lot like a PSU that is being strained to the breaking point to me.
Some of them are,it wasn't happening before though,that's what confusing me.
I've had this PC for bout a year now no problems,just started randomly one day.
Memtest86 and Prime 95 passed