IBM T20 won't start

My IBM T20 (Win XP) will not start up beyond the IBM welcome screen and the prompts to use F1 or F12 to access the Bios. There are no beeps. The disc access light illuminates for a fraction of a second. Pressing the F1 or F12 has no effect. I have reseated the hard drive and RAM. I have tested the hard drive in another machine which has proved it to be fine. I have tried the trick of discharging capacitors by first removing the battery and mains supply and then holding on the power button for 90 secs.  I have tried to boot from a bootable floppy downloaded from IBM's website but the symptom is unchanged i.e. no prgress beyond the welcome screen.  I have tried using a Win 98 start up disc. I have tried pressing repeatedly F8 on start up, as advised by IBM,  but no effect.  My amateur assessment is that I must change the system board at great expense.  Are there any other steps I can take to eliminate other possibilities?
avhationAsked:
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ridConnect With a Mentor Commented:
Possibly a CMOS reset might have some effect here. How that is done on an IBM T20 is not known to me. Also if you have more than one RAM module, try with one only at a time. Try starting with all removables removed (HD, FDD , PC-cards etc).
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