Bad Checksum (Rom) Error

I'm running a Toshiba S1800-400 LapTop, running ME. Suddenly it's starting
to play up with windows freezing producing either: -

OE 017F BFF8E64B or
OE 0167 BFF9A0F

BSOD's

Now it's refusing to boot past the safemode startup - if I check start
windows normally, it just comes back to the safemode option. Booting up to
safemode usually hangs the os after a minute or two and when booting, now
shows "Bad Checksum (Rom)"

I noticed prior to these problems, that boot up sometimes didn't occur until
I tapped the Laptop and also sometimes the os would freeze when inserting a
cd or dvd rom.

Am I suspecting a damaged or broken CD/DVD Rom drive?

Anyone else have this problem or could give me advice please?

TIA

Paul




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