So, until today my old(ish) dual-core PC (with boggo onboard graphics) was running faultlessly. This afternoon I had to move my router to another room and switched from a wired ethernet connection to a wireless card. Connected fine, but now it crashes 5-10 minutes after booting up - the screen freezes, then changes to tesselated pixels and remains that way.
If I take the top of the case off, it runs fine - until I activate the wireless connection, then crashes shortly afterwards. If I leave the case closed, it crashes after 5-10 minutes regardless of what I try and do.
I cannot figure out how the hell a network card can be causing such a massive problem (presumably overheating?). The same card has been used in my OH's antique small-form PC for months without causing any issues whatsoever (in fact that's the set-up I'm being forced to use again now). I'd rather not spend ££s on a 20-metre network cable unless I absolutely have to... any ideas?
Much gratitude in advance
...pretend here is reality, and not some expectant itch of july...