G61-327CL wont boot; Flashing power lights

A friend gave me his old laptop because it didn't work. HP G61-327CL. When you try to turn it on, the power/charge/dvd lights at the bottom left just flash 3 times. The middle (charge) light seems to be brighter than the other 2, so it's possible that's actually the only one flashing, but I have no clue. The charging light comes on when it's plugged in. I've tried a hard reset, after which it gives four flashing lights, the last one being held for a second.

Any help would be appreciated!