The automatic stand-by function seems to be working correctly on my PC but it shuts down automatically for no apparent reason periodically and won't start up again. The power supply has to be turned off several times to get it to start up again from fully shut-down not stand-by mode.
Follow ArrGee's advice and whilst you've got the lid off check that all the fans CPU and System are working. If a computer auto shuts down and then doesn't turn on again straight away, then it's usually down to overheating.
It's happening probably because of Overheating, for which they've given you the solutions for. Just get a brush and get all the dust out of the fans and any grates in your case. If it's still doing your next best bet is replacing the Power Supply Unit.
I've just vacuumed all openings on the rear of the CPU to ensure that dust is not causing it to overheat. Under the Events Viewer at around the time this last occurred it states 'TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts'. Would this mean that it has a virus?
PC has started doing this again, only when not in use. It's as if it has gone into stand-by mode but when the CPU button is depressed nothing happens. After several attempts it will work- should i just replace the PSU or could it be something else?