My computer is starting to scare me

[guanin]

The screen keeps blinking green for half a second. It just got stuck on me in some weird pattern I'd never seen before and it wouldn't even go into hibernation when I pressed the ON button, which is what it always does. I took the battery out, restarted it in safe mode, then in regular mode, but it keeps doing that. It's never done this before. Dammit, I don't have a backup computer if this goes to hell (unlike my dad, who has three, but he is a technology junkie and a longtime job. I used to find it a bit silly, but not anymore). Am I going to have to ask the HP people about this? Because no one ever knows what the hell I'm asking no matter how plainly I explain it to them until the fourth technician.