PC just closed down....

Hootsmon

just the centre tower, clicked off.

tried it again in two minutes and it huffed and puffed into life....WTF?

working again but for how long....?

boogieman

Checked the fan's working/ not full of crud? 

Gassage

Phew- was just rushing off to buy the TES in the classifieds....

Panama_Jack666

Sounds like it over heated.

Danny1969

Could be soft fuse : anything drawing current from USB port ?

paul_c2

Its not Windows 10 is it? It will randomly restart to apply updates, whenever it damn well feels like it.