Just started happening this last two weeks.
About an hour into PC usage sometimes more, my screen suddenly freezes up, mouse pointer wont move. Screen then goes black and i get a message that there is no signal. Even though the PC is obviously still running. (its not a monitor fault as i have a laptop running through it too which works fine).
CTRL/ALT/DEL does nothing, system cant be reset any other way than a hard reboot.
Utilities are telling me that my MOBO temp is 114degrees (it isn't, id be able to smell it and the case is cool to the touch).
To be fair on the system its now approaching 4 years old as it was built in spring 2013.
Asus z87k mobo
i5-4670k cpu
Asus 760gtx
Maybe its just getting a bit long in the tooth, but id like to have an idea of what is dying first.
Cheers
R