Is the PC in the trunk or close to the EQ?  It may be just a matter of
the cable being too long and picking EMI from someting along it's path
in the car.  I'm no expert, but that's what I would check first.

I'm currently working on a switchmode PC power supply that runs from the
cars battery directly and outputs around 5-10A on the +5v and +12v
lines, which should be enough for a basic PC with a hard drive and
cd-rom.  I plan to build it into an AT power supply housing and use
screw terminals on the back to connect the battery supply.  If you're
interested, take a look on google for car mp3 player power supplies,
there's tons of schematics and good stuff to make one of these power
supplies.  The MAX787 looks like a condidate.  I'm sure the efficiency
of a battery powered switching power supply would blow away the
traditional Inverter setup.

Anyways, good luck...cheers

--
Matthew J. Brush
Lead Developer/Owner
mbrush@leftclick.ca
www.leftclick.ca
LeftClick.ca Internet Media Services

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