I have seen a similar phenomenon on a laptop due to over-heating. David. On 7 Oct 2005, at 13:15, Ruqayya Abdus-Salaam wrote: Please help. I bought a used Titanium Powerbook G4 15" 667 MHz with 1GB of ram and an 80G hard drive running Tiger. It came loaded with software from ebay with a 30day guarantee. I was ecstatic for the price. Worked great for the first month I had it. One night I was working on it and the screen suddenly zapped out to vertical stripes. I restarted it and it came back - but not for long. It gets hot - sometimes enough to "shock" my wrist but I don't know if this has anything to do with it. I can get it to come on for a few minutes at a time but the least jarring movement will zap it out again. Sometimes it works for a couple of hours then "zap". It may get small fuzzy squares then it goes to vertical stripes.But when it does come back with a clear screen the data is intact and the image is clear.