Oh, oh. How much screen activity do you see before it quits? If
nothing-(Screen 'Power up' [green]lite), screen backlamp (if LCD), any light
on the tower or laptop comes on, it's not seeing the hard drive. That may
mean failure of the HD. Do you have an emergency boot disc? If a tower, you
might even look for a light on the ethernet card (green).
If there's no activity, unplug for a minute, and plug in again. If you get
any reaction, watch the screen closely for dying messages, like "Boot error -
Can't read disk or drive": HD is gunnysack; or "Boot error - Please remove
disk [and insert correct........] may mean HD is failing during the boot up
POST (test) or there is corruption in the BIOS or Startup procedures. Good
luck. If you have another internet connection ('puter') available, go to IBM
or call them w/model of your machine & ask them if there is a reset, or to
help you. Of course, if it's out of warranty..............