Hi Gary
Well, it could be caused by many things, hardware, software driver, try to
Open the Case the Remove the Dust by compressed Air Can and take out the
PCI
cards and reseat the Memory, be careful in this process to handle thing
with
care and before touching any thing Just hold the metal frame for 30
seconds
to Neutralize or equal the Charge in your body with the system or
discharge
yourself first then handle the Expansion cards and remove them from their
slots.
Also Disconnec and reconnect the Data ribbon Cable from the HDD.
After all clean relocate them back firmly in their slots and close the
Case.
Be sure to unattach all hardwares attached to the computer and Power ON
the
machine.
If the above not your Cup of Tea and you can't do it, then it is good to
safe yourself the electric shock and take the machine for a local
Professional IT tech person and He/she will do it for you.
HTH.
Regards,
nass
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www.nasstec.co.uk