acer laptop aspire 3620 is not booting. When turning on or restarting the display screen does not always come up. I don\'t know if it is booting or dead and I have to perform a hard shutdown--when boot is successful, pc crashes showing the dreaded "blue screen of death". How can I fix? I have been told that the problem may be because my battery is bad--I do not run my laptop on battery power, it is always plugged in at my desk.