Hello guys, sorry but iam new with posting problems in a forum. I tried to post my problem here but couldn´t. I hope Iam not doing anything wrong here. I have an Acer Aspire 5100 too, vista premium preinstalled. Everything worked fine, till I did this stupid thing. I installed Xp (Ive allready done it, and did it again because is faster. Problem, Shutsdown after a while). I thought its the bios that needed to be updated. So I did it in windows. It went well till it shutted down! I knew what kind of trouble that might lead to. And now it wont boot, nothing happens except that the fan is running and the cd drive light goes on a while and stops. I tried USB flashing, but dont read usb stick, I copied the Bios on cd but nothing, pulled out the memory, starts it, nothing. No sounds. Only, the screen blinked a little, black screen. Can someone please help me?????? What can I do? I would very well appreciate it.