Hi, I'm not sure this is the right place to ask this q. I have an Acer TravelMate 5720 with windows 7 ultimate on it. I have no idea what happened but one day I was browsing and watching a promotional video on a website when the screen froze and I got white lines accross it. The problem seemed to happen every time I restarted the cpu. No idea what could have caused it. Everything was working fine prior. Then, after a few restarts/refreezes, I kept on getting startup errors and windows refused to start. This was in April. I haven't touched the computer since then because it seemed dead. Now, a few months later, I decided to turn it on and low and behold, it started up fine, until it got to windows where it said logging on and then gave me a blank screen. I then restarted with wifi off and it works, I'm using it right now in fact. My question is, how can I know this won't happen again? are there any tests to run to see if there's something inherently wrong with my computer? I'd love it if someone could help. I posted in the malware forum before and got great results, so I have great faith in this forum Any help much appreciated.