video interference with HD activity

I have a nice Powerlite TurboSparc laptop, which in general works great. However - I've noticed that if I connect an external monitor, there is a noticable flicker in the display when there is HD activity. I've tried a few things: 1) First I removed the internal 2.5" SCSI disk and mounted it in an external Sun shoebox. This made no difference. 2) I tried an external 3.5" HD (with no internal drive) again no difference - so persumably the HD is OK. 3) I tried beefing up the original PSU (2.5Amp) to 5Amp. This actually reduced the flicker a little, but not much. Any other ideas? I'm wondering if there is some suppressor circuitry on here that is failing in some way? Other than that, the unit peforms great, and because of its compact size - its a nice unit for running older "vintage" software. The internal LCD panel works fine, no flicker is visible on that. Thanks in advance. Ian. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com