My PC re-starts after turning it off
This takes longer than a planned Restart - maybe 2 or three minutes.
Certainly enough time to turn-off and leave my desk.
I do hear a double click once or twice before the re-start - maybe a switch re-setting?
The most certain way I have to stop this is to power off (use the switch on the PSU), rather than leaving the PC on stand-by.
Any thoughts?
Hmm, do you have some kind of “start by LAN” or similar set to on in the BIOS?
Some BIOS also have a setting form what to do when you press the power switch (not the PSU one, the one on the front). Just an idea, it sounds related so worth checking.
do you have some kind of “start by LAN” or similar set to on in the BIOS
I did Mikke, and have now switched it/them off
Some BIOS also have a setting form what to do when you press the power switch (not the PSU one, the one on the front).
I don’t follow Joe, so probably not (I’m presuming you don’t mean the disk boot sequence).
New info:
I’ve had the PC switched off at the mains for some hours.
Powering back on (PSU), and switching on (front), nothing happened - except that the M/B displayed an odd Post Code.
I have a copy of the MB manual on another PC, so booted that up to check.
After finding the manual, and finding that code NOT listed, the PC booted up.
That took more than two minutes to boot, maybe more than five minutes.
I think - hope - this is a PSU problem
The PC would not switch on this morning, so I swapped the PSU. For now the PC is working (just hope I’m not writing too soon!).
The old PSU is an OCZ unit rated at 520w (620w peak).
The current unit is a generic 500w :(, it’ll have to do until I can get a reasonable PSU.
{edit}
FYI: The problems recurred with the network cable disconnected - so remote wake-up / log-on is not the main issue here.
It’s still good security to disabled it in BIOS - done now 
{/edit}
Some machines had a number of strange start up options - tapping the space bar on the keyboard to start the PC was one annoying one I remember. Drop a book on a workstation desk and get half a dozen machines booting up. Might be worth checking what’s buried in the BIOS, power saving options, etc…
Also interesting that it is a very slow boot… is it running some diagnostics, or an anti virus scan?
Edit 1 The BIOS setting (if you haven’t found it already) will be something like Power > APM Configuration > Power On By … with a list of ways to start the machine. Make sure mouse, keyboard, telepathy etc. are disabled
Edit 2 The power button on the PC works simply by putting a momentary short across 2 pins on the motherboard. If all else fails, may be worth checking the switch and the wires from it are OK
Thanks PeeGee
There is an option to enable key-pad booting (or whatever) but that’s disabled in BIOS.
For slow boot, read delayed boot - however …
The rebooting problem went away when I replaced the PSU.
Deciding that it was a PSU problem, I’ve ordered a new PSU … only …
Tonight, when I switch on with my temporary PSU, screens stay visible for about 0.5 to 1 second, then blank …
That is, I see the splash screen for BIOS <blank> polling screen <blank> Windows splash screen <blank> and just long enough to see the mouse cursor on the login screen (but no log-in promts so no password entry :()
I really hope that’s PSU issue, but somehow, I have my doubts
At the moment, I fear a motherboard problem 
I’m not sure that this is relevant, but:
Within the past month, I’ve replaced an old CRT with a flat screen monitor
Screen resolution is very much higher with this new monitor
Within the past month, I’ve replaced an old CRT with a flat screen monitor
Screen resolution is very much higher with this new monitor
Probably the system is stunned by the new resolution and gasps from amazement…delaying the boot.
My system did almost the same thing except that the boot occured during the use of the system. It rebooted at random, the cause layed with XP itself (dll nightmare)so I reinstalled XP and it was gone.
Is your problem solved yet?
Try removing everything from your MB (soundcards, network etc) remove and reinstall your graphcard and make sure it’s secure and has the right power. Run with one bank of memory, switching all dimms once. If it runs ok, put back the cards one at a time.
s your problem solved yet?
Yes, thanks Dusty. I replaced the PSU.
The old unit was an 520w OCZ unit
This one is a Corsair HX620W
Other system changes are:
I’ve lost a USB card, which may need re-seating (hope)
And unplugged one case fan - it would (potentially) leech air from one of the PSU fans.
The monitor is interesting
Back in the Mesolithic era, we used to have televisions based on black/white CRT technology. If you wanted to watch - say Dr Who - you’d switch on 1/2 hour before the program was due to start, just to warm up the CRT.
My new TFT seems to want the same treatment - switch on 1/2 hour before the main show 
And what did Doctor Who say about it? :roflmao:
(I feel very sorry for my unrespectful attitude towards a much appreciated Squadron Leader who lent me a lot of airplanes: Hurricanes, B25s. Mossies…;))