I am running a AMD FX 4100 quad core processor and R9 270 Graphics card (but it did it with old graphics card also)
Since updating to Windows 8.1 the system will be fine for a while then just lock up ... the screens go to sleep but computer is still running, sometimes it reboots, sometimes it doesn't ??? sometimes it just keeps locking up while trying to boot up ???
My processor is running at 100F when it is loaded
Its driving me crazy !! I have changed memory, got R9 card, changed bios battery, applied new putty on processor/heat sink, formatted HD and did an install of NEW windows 8.1