Hi,
Please do try these troubleshooting steps that may help in solving that issue.
- Do a hard reset first, remove the battery and AC adapter then press and hold the power button for 20 seconds.
- Next is to reseat the RAM, remove them all for couple of seconds then put them back in making sure that every RAM is seated properly.
- If these doesn't work try to boot the laptop without its battery and see if it will boot up normally.