Just resuscitated an ailing Cyrix P6 II 333mhz machine.
It had some duff memory, and was of no further use to the owners.
Put in some new memory, graphics card and LAN adaptor.
Connected microsoft keyboard and a new Microsoft Intellieye mouse (optical).
The system seems to work fine now, except that after powering down, the keyboard and mouse appear to be still on. The Num Lock light on thekeyboard is still on, as is the intellieye sensor on the mouse.
I can solve this by removing and then replacing the keyboard ps2 connector. Just doing the same to the mouse PS2 connector does nothing.
I noticed that the PSU main on/off switch is a little soft - could the internals of the psu be doing the same - not resetting the keyboard and mouse?
Could anything else be to blame (the ps2 controller maybe) suggestions welcome.
I don't mind replacing the PSU if that's what it needs, I don't want to fry anything on here!

Are you switching the power off manually after closing Windows? If you have shut down all power and the kybrd/mouse are still getting power, it suggests a power leak and that suggests a short. I would disconnect all power supply and look for any evidence of loose wire or powered metal touching that shouldn't be.

There is another thread that has been looking at how to test the power supply and you might get some ideas there or solicit ideas from the experts who have been posting there. I believe this is the link to that thread, if not, I will do an edit.

http://www.pcguide.com/vb/showthread.php?threadid=16373&goto=newpost

Good luck,
Budfred

Are you talking about the power switch on the front being "soft", or a rocker switch on the back of the computer that turns off the PSU.

What you are describing is normal on some computers when you turn them off using the front power button or when they power down by software.

I don't think I would worry unless you are talking about turning off the rocker switch which turns off the PSU and should definitely turn off everything including mouse, keyboard, etc.

Sorry - should have clarified things. Yes, I'm talking about the main 'rocker' switch on the rear of the psu. I'm going to get a DMM today so I can measure the voltages (my old one gave up a yer ago) and get a replacement PSU as well - if nothing else it will do for a standby.
Thanks for the info -I'll keep you informed.

Ok, just took out the PSU and opened it up, to see if there were any loose or dodgy connections.
Inside was like the rest of the machine when I got it - I think the former owners must have used it as a vacuum cleaner!
I replaced the PSU with a new one rather than mess around. The symptoms I had have gone - sort of.
If I power down, the keyboard and mouse stay on, bit if I flick the PSU switch off, they go off a couple of seconds later.
Probably one of those Mboards that leaves the PS2 on (for whatever reason), but the PSU side of things were screwed up....I hope!:D

Look around in the BIOS for power management settings and make sure that it set to OFF and not some standby setting, and that any "wake-on"settings are also set to off.

What happens is with an ATX power supply there
will be 5V Standby Voltage going to the Mboard unless
you use the rocker switch on the rear to completely
kill the power source.

There is a Num Lock option in BIOS that can selected as
disabled to eliminate the Num Lock light.

Please do not plug/unplug ps/2 devices while the system
power is on. Doing so will kill the PS/2 port.


RD.

Just checked the bios again - no power saving/instant on settings enabled, but it may well have something to do with the bios anyway - pressing the enter key reboots the system from POST.
There doesn't appear to be any other bios settings which should actually enable this, but it's an oddball bios anyway - the boot up sequences are weird to say the least - no option for FDD-HDD-CD, although some options are there; the closest one to this is FDD-HDD-SCSI!! (there's no scsi devices on it though).
Ah well, thanks for the pointers folks - it seems to be running smoother with the new psu anyway:cool: