Satellite P10: white and purple clouds fading across the screen when booting

I had been having problems with my SP-10 laptop so I bought a new hard drive (Fujitsu 60GB instead of standard 40GB) and fitted it myself. I was working fine with this for a long time until suddenly I had the strangest problem I have ever seen on a computer...
Sometimes, when booting the laptop, instead of the normal red "TOSHIBA" screen and the Windows XP startup message, the laptop simply shows some weird white and purple clouds fading across the screen, eventually fading to a very dark but not quite black screen.
I thought to begin with it was a problem with the DVD drive, as when it finally gave in and booted normally, the DVD drive was disabled. However, I have noticed in the BIOS, under "Advanced" that the InfraRed Port shows intermittently - it shows with the [Disabled] setting next to it, but will then disappear from the listing, then reappear again, and then go again and so on.
Sometimes my computer will be operating normally, then completely lock up (mouse and all) and will reboot with the clouds!
I have looked in the Windows Event Viewer for when the notebook has locked up and have seen something to do with an IRQ problem for the Infrared Port. I disabled the InfraRed port in Device Manager (I managed to enable it in the BIOS by loading standard BIOS settings) and restarted, but it started up with the clouds again, so I have a feeling the InfraRed port is the culprit - perhaps faulty hardware/loose connection as it is located quite close to the DVD drive and HD drive.
I was just wondering if anyone has ever seen anything like this before on ANY computer, and if they knew how to resolve it? It seems completely illogical that a faulty IR port could alter what is displayed on the screen at bootup, unless of course there is something wrong with the boot sector of my HD?
Any ideas?
Thanks.
Tom

Well I can assure you my laptop has an InfraRed Port on it - I used to use it with my mobile phone for various things but don't bother now.
Good idea about attaching another monitor - hadn't thought of that. I will see what I can come up with.
I simply don't understand how anything except the display driver could be causing this, unless of course, another piece of hardware is conflicting with the display driver. But then why would it be intermittent and not constant? Anyway, I don't seem to have had the problem since I disabled the IR port (except the first time I disabled it) so here's hoping it's fixed.
Will definitely try attaching another display though. Good thinking.
Thanks,
Tom

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Satellite P10: white and purple clouds fading across the screen when booting

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