| The rule of thumb with faults like that would point towards it being hardware, if a reboot doesn't fix it, then the next one does and you aren't doing anything in between it probably isn't software (unless it's _extremely_ buggy software).
I would guess you've got some static damage somewhere. If a few tracks are partially ablated by wear and tear or a static charge, you'd get different behaviour based on the temperature and humidity in the atmosphere. As the laptop warms up the behaviour could change too.
Probably the video chip itself but it also could be the bus or RAM doing that.
I assume the same problem occures if you plug in an external screen and keep the laptop screen switched off? |