Hi,
Please do try these troubleshooting steps that may help in solving that issue.
- Start by doing a hard reset, remove the AC adapter then press and hold the power button for 20 seconds then test it after doing so.
- If these will not work try connecting your PC to an external monitor and see if you'll get any display from it.
- Also do reseat the RAM's, remove them all for couple of seconds then put them back in making sure that everything is seated properly.
- If all these will not work do test the AC adapter or better yet try another adapter.
- The motherboard is faulty if all these will not work.