So, today I found a Compaq pc with Windows 98 laying around. I tried booting it up, but shortly after it's booted up, the screen becomes completely white, and when the screen turns compelety white, there's absolutely nothing I can do. The only thing I can do, is turn off the pc. Sometimes, I get into the pc, but around a minute later, the pc hangs itself, lines begin appearing, and the screen becomes totally white again. What causes this, and how can I fix this? (I'm not very pc technical).