Higgs Boson wrote:

They sold me a policy to "fix anything wrong on computer".

That should be a red flag right there. I've had several boxes that went
flaky when the video adapter started to fail. The symptoms don't necessarily
point to the card, and replacing it, while easy, isn't something they can do
over the phone.

We've had clients, supposed 'IT professionals', that have managed to fubar
systems. The last part of that acronym is 'Beyond All Repair'.