I was cleaning out my basement today & ran across my old HP Pavilion ze4900 laptop & I remembered it cut off one day & just never came on again. I toyed around with it to no avail. I have another laptop now but I would like to get my files (MUSIC, pics, videos, etc..) off of it but I need to get it to turn on.  Here's the thing: When I tried to turn it on, the battery light turned yellow & blinked, basically telling me it wasn't charged. So I fully charged it (battery light turned green, letting me KNOW it was fully charged), hit the power button & it blinked 3 times....but didn't COME on/boot up. Sooooooo is this a hardware problem or do I just need a new battery? Any help would be greatly appreciated! Thanks!Have you tried booting the laptop with the adapter in, but no battery?

It could also be a motherboard fault that is CAUSING it to be unable to boot.

On a positive note, you do not require the laptop to be operational to recover the data.
The hard drive can be removed and inserted into a laptop or a desktop MACHINE using an adapter from ebay or newegg, or you could contact your local computer store about one.