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try to boot your PC first on safe mode and restore the computer back to the date where it is working fine by using system restore. if same issue occur. you have to reinstall your operating system by using the recovery disk. your windows is already corrupted.
You have to completely disassemble the whole laptop in order to get to the motherboard & actually remove the original soldering to remove the DC power jack from the motherboard. One thing you need is the right tools (Screwdriver) and the soldering gun.
Google & research a guide for disassembling your IBM Thinkpad T42
Unlike the newer laptops, the T42 doesn't have it's own wireless switch. So in order to get the wireless working, you need to also make sure that the Power Management driver and the Hotkey driver are installed as well.
The sympton is rather vague, but I suggest the following options, to be followed one by one, until one of them works for you.
1) Boot your system in Safe Mode (if Windows is your OS) by pressing F8 after the usual "beep" provided by the BIOS after it detects all is fine. If it boots up, which takes a little longer than usual, then your system is probably Ok, although it may have a configuration problem.
Reboot the machine from the shut down menu and hopefully it will work Ok. If not, then, depending on whether you have Windows Vista (or better), try:
2) Boot again pressing the F8 key, but this time locate the option that reads something like "Last known good configuration". Highlight it with the arrow keys and press Enter.
If you have System Restore set on your drive(s) your laptop should boot up normally.
3) The last option would be for you to go into your system BIOS and run at least a HD detection test, followed by a memory test, etc., but I would only recommend doing this if you know what you're doing. If not, ask a friend for help.
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