[I'm not keen on changing the DE Anglo, I'm used to KDE.]
A live distro to usb would be as temporary as possible.
[No problems with the machine running cool - it's a monster in size too. And no I can't borrow another card - all my friends are computer illiterates unfortunately.
]The salient factor is the temperature of the card { Addendum : or if the card is still seated properly}
[ Being retired I use the machine pretty well every day - morning, afternoon and evening. Plus I'm one of those users who believe in switching it off when not in use so it gets switched off three or four times a day..]
I was referring to type of usage, e.g transcoding video's ,ripping cd's , massive number crunching, playing online games , or simple email, that sort of thing.....







However I downloaded, burnt and installed the correct version. And all to no avail - I'm still getting the same shutdown problem. The 64bit is not appreciably better than the 32bit. And not exactly up to the minute with an ancient Firefox 