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I have (2) thinkpad T21, and (2) thinkpad T22, none of which will boot at all.
All will power on, (green power light is lit), all give various beep codes, none will show anything on display. I have reseated memory and change memory from one to another. (1) T21 was working but now it wont boot. I have removed cmos battery, some of which were bad, (got checksum message and invalid date and time). Strange that all are like this. Could it be bad cmos battery, bad ram, bad video etc. Have not dissassembled to check connections yet. Have removed batteries and cmos and tried to boot with ac adapter. Any suggestions would be appreciated before I begin to start looking for system boards ! THANKS !!!
 
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