Acer ASPIRE 4520-5141 AMD TK-57 1.9G 1GB 120GB · blank screen

OOPS.... OK.... it may be serious but it may also be easily solved. If what i tell you now doesnt work then the laptop is KAPUT.
Remove the battery... then remove the hard drive and the memory chips. You should find all these under latches at the bottom of the laptop .... the hard drive sometimes pulls out from the side somewhere.

ALSO TRY ANOTHER POWER SUPPLY because youyrs may be faulty. TRY ANOTHER POWER SUPPLY FIRST OF ALL !!

Once you've done that you must put it all FIRMLY BACK... If that DOESNT work you may have a DEAD computer.