T500 won't stay powered off

Hi,
I am very satisfied with my T500, which serves me well. One small issue:
I am unable to power the T500 off by shutting down the OS. First I thought, well, Linux maybe can't handle the power down but:
Linux has been handling the power off successfully for the past two years.
If that was the case, then it would just stop at the end of the shutdown process. My notebook doesn't do that. It reboots.
I then tried to press the power switch (at the "Thinkpad logo" screen prior to boot) until it shut down; it did, but came back to life after a few seconds, booting again. I tried turning it off for some minutes, then resorted to cut the power by removing the battery when no file system was in use (prior to boot).
Later I discovered that it seems to work with a power off if I disconnect AC power, but I cannot say if that is the case. Update: No, doesn't help any. It seems like coincidence if it actually stays off.
Is this known? Is my thinkpad a workaholic and wants to keep running? Does it just not know when to quit?
Advice please.
Greetings
-T.

Have you updated any of the software recently? Changed any hardware? What flavor of Linux are you using?
My gut tells me its a hardware issue and not a software issue, since the machine refuses to stay off. I suspect that something is either pressing on the power button or causing some kind of intermittent short. Obviously, this is not causing the computer to turn off once it is on, so it is not acting as if the button is being pressed and held in. Regardless, lets try to isolate the source of the problem.
Please check the BIOS and disable the Wake on LAN or any other wake functions accessible to you.
Please try this and tell me what happens:
Save any pending work
Close any open programs
Go to a console
Issue the following command as root (either with su, sudo, or as appropriate for you Linux flavor)
shutdown -h now
You should see a message that it is safe to shutdown, and you may then power the machine off.
If that doesn't work, please follow 1-4, but try issuing a "shutdown -n now" instead. Remember to do this as root.
Please let me know the results of either command.
If the shutdown command was not able to solve your issue, then we can try advanced trouble shooting.
With the computer off, unplug the computer from the power adapter and remove the battery. Then hold the power button in for about 30 seconds. Then alternatively tap the power button and the ESC key. Once you are done doing this, put the battery back in, plug the computer back in, and hope it stays off. If not, we can try the next step in the process.
I am assuming your computer is no longer under warranty. If a warranty still applies, I would have a tech attempt to solve the problem. If you are out of warranty, then I suggest you disconnect the internal keyboard and see if that resolves the issue by following these steps:
Find an external keyboard and confirm that it works properly under your operating system by plugging the external into the system and using it. You should also make sure the external keyboard will allow you to access the BIOS. Leave the external plugged in.
Shutdown the system properly (by removing the adapter and battery prior to any drives being mounted).
Follow the hardware maintenance manual, and disconnect the keyboard from the system board.
Partially reassemble the computer, but leave the keyboard disconnected.
Put the battery back in & plug the computer back into the wall.
Hopefully, the machine will not stay off. If it does, you may want to purchase and install a new keyboard and hopefully your issue will continue to stay resolved. If it does power back on, use the external keyboard to properly shut the machine down, and then reattach the internal keyboard. Let us know the issue isn't resolved, and maybe someone else will have suggestions, since at that point my only thoughts would be to remove devices such as RAM, disk drive, etc. one by one to see if the issue resolves and if it does, then replace the part. If the issue remained unresolved after that, I would consider either living with the issue, picking up a known good system board on ebay, or replacing the system.
When asking for help, post your question in the forum. Remember to include your system type, model number and OS. Do not post your serial number.
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I called Apple because the SSD was recalled for that year and the symptoms of a failing hard drive is random rebooting or powering off. So apple said they would fix it for free.
I am not near an apple store so I took it to an Apple licensed Technician to get the new SSD. I got a call a few days later saying that the SSD was fine but I need a new Logic Board. He said it was the most expensive part of the laptop and that sounded very convenient for him that I need the most expensive part, about $478.00.
I would like to know the symptoms of a Failing Logic Board and the SSD
I can never get a straight answer from reading Apples forums.
This laptop was 1300.00 new and I had to buy it from my Ex again for 200.00 when she couldn't fix it. So im tired of putting money in a laptop that cant even run games or hold my entire iTunes Library lol.
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,

Amsys plc, the company Apple uses for off-site repairs returned my iMac20 today and the accompanying advice note states that the fault was resolved by replacing the power supply unit. I am really grateful to Apple for finally getting to the bottom of the problem, particularly as the repair was done free of charge, although I had already paid £49 for a useless workshop investigation at the Kingston store. The service given by Amsys was exemplary... the collection and return of the machine was carried out at the times promised and whenever I contacted the company by phone, each person I spoke to seemed to have knowledge of the repair without having to refer to the case notes (and none of the 'press 1 for service, 2 for sales...' rubbish).
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