That "BIOS ROM checksum error" sounds like a low CMOS battery. Look
for a silvery cell about the size of a 25-cent coin (voltage should be 3.0V)
in a holder; or a cylinder about 3/4 inch long, with plates at each end
soldered to the board (voltage should be 3.6V) - usually near the keyboard
connector. Before you remove and replace this, try to get as much
information as you can. There may be a replacement kit that plugs onto pins
on the motherboard so that you don't have to solder (but you should still
clip off the old battery).
You will also need to run Setup...
Boyd Ramsay
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