I recently had a problem my pc, basically, it would freeze, sometimes with pink and green vertical lines appearing accross the screen. The only way to restart the computer was to do it manually, but it wouldn't start, at all.

The fans would run, but nothing would appear on the monitor.

I have since decided to get a new pc and am waiting for it to arrive. The pc was very old after all, and I wasn't great at keeping up to date with security.

In the meantime, I am using my laptop, but just two hours ago, I had the same problem, it froze, I switched it off, then back on, but nothing.

Somehow I managed to re-install windows on it, and here I am asking for help. How can this same problem happen to two completely different machines? Is it anything to do with external software I'm using?

I just don't want it to happen to my new pc when it arrives. Re-installing windows everytime I want to use the machine won't be much fun at all.

I hope someone can help, thanks in advance.