T43p Automatically Reboots After Shutdown... Help!

[olex126]

Purchased a half-dozen T42p/T43p units, (a mix of 14" & 15" units) with the caveat that one or two of them "don't work right!"

T43p (2668-G7U) machine runs perfectly fine....until shut-down. The operating system shuts down properly, then 3 seconds later the laptop reboots itself.

Does this whether on battery, plugged in, or both. Charging circuit works fine.

BIOS and EC are the latest available, BIOS set to default settings.

Reboot process happens under Win XP, Win 7, and Linux Mint, so definitely a hardware issue.

If there are any Motherboard Guru's who could point me in the right direction as to what to test, or offer any suggestions, I would be very grateful

Thanks. Regards. Dave

[Hans Gruber]

When was the last time you replaced the bios battery? Next question. Have you considered doing the elaborate hold the power button down 10x for 10 seconds followed by 30 seconds for a final time without the battery or any power connected?

Those are my first two suggestions.

[Hans Gruber]

Dave, I took out one of my T43p's to help you figure this one out. Have you pulled the bios battery or reset the bios to default settings? You said the T43p was resetting after shutdown after 3 seconds and was on default bios settings. Try doing a hard reset of the bios to default settings.

[olex126]

Hans.... Thanks! That did the trick

Pulled ALL the batteries, unplugged the laptop, drained the capacitors, and then installed a new BIOS battery..... Right As Rain!!

Now, when I tell it to "Shutdown", it STAYS "Shutdown"!

Before I drifted off to sleep last night, I accidently hit "Suspend" instead of Shutdown in Linux Mint.... the laptop actually stayed suspended. Subsequent attempts to duplicate it again failed, and it went back to the Restart-after-three-seconds routine... Got me to thinking that perhaps the laptop was possibly suspended (or hibernated), either by itself or in a dock, and then either the power failed, or the previous owner may have removed it from the dock and then resumed operation, confusing the BIOS because it was restarted NOT in it's last known state.... maybe kinda scrambled the BIOS a wee bit.

Whatever the cause, it is working fine now. Thanks again Hans, and maybe my experience (and your solution!) will help someone else if they have the same problem.

Regards. Dave