First do a hard reset, remove the batter and AC adapter then press and hold the power button for 20 seconds. Put the AC adapter back in and see if turns back on normally, If it does put the battery back in as well. Next is to reseat all the RAM from the laptop. Put them back in after couple of second then power it back on. If all these doesn't work, try connecting an external laptop into it then see if you'll get any display because if it doesn't that might be a hardware problem (motherboard) and repair or replacement is required.