new motherboard, new problems?

[PW Armstrong]

installed a new motherboard a while back  (OK, OK, it's not new, but's 
it's new to my old computer)
had some problems with monitor/graphics card settings, which I fixed 
with help from lenn (actually, there wasn't a problem, I just decided to 
ignore/not check the monitor settings, and assume it was a graphics card 
issue, which it is was not)

but ever since the new motherboard went in, have been having a handful 
of other annoying glitches.
In order of annoyance/inconvenience:
-mouse randomly goes whacky, i.e., wanders randomly over the screen 
whenever I move the mouse, rather than tracking the physical mouse 
movement (actually, the vertical movement tracks correctly, the 
horizontal movement goes random)
-mozilla/mozilla mail (vn 1.4.1) randomly freezes on me (never did with 
the original mb) (I think the first is related to a mozilla problem, 
since it always occurs when I'm accessing an e-mail or e-mail folder 
from mozilla)
-when I power down, computer does not automatically shut off as it used 
to, even though the 'power down' command is executed
The first 2 are fixed by rebooting.

Oh yeah:
-running RH 8
-motherboard:  ASRock M810LMR

Any ideas/suggestions for correcting these problems?  Thx.

-peter

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