I have a Acer Aspire 5735Z that, when the power button is pressed, the power light stays on for a short time, then powers off. While the power light is on there is a black screen, nothing is displayed at all. The fan will start up and then stop. I have checked the hard disk with another computer and it is empty!!! I am assuming it is a problem with the BIOS. I have tried various options using ESC + Fn with a USB drive, but so far have been unsuccessful. The BIOS file for this drive is CPK10.WPH (I think). The OS should be Vista. The laptop has no floppy disk of course, so I can only use a USB. Any help would be appreciated, to say the least!!!