Thank you for the reply.
Let us know the status of the power LED.
Unplug the power cable. Press and hold power button for 10 seconds. Turn on the system.
If the issue persists, reset the CMOS battery and ensure all the cables are connected properly. You may use the manual by clicking the link mentioned below:
NOTE: Reseating of system component is to be done by a professional only.
Thanks & Regards