Hp desktop won't boot?

This hp desktop d530 CMT won't boot, upon powering up it will only show the HP welcome screen, if I immediately press either F10 or F12 to try to get into the boot menu or setup, all I would get is a black screen with a cursor blinking, also the 2 optical drives shows the the green light but their drawers are not opening, any ideas please?

 

Could be short on power, I suppose. How is the power supply unit?
Have you checked that all cables and connections are tight? RAM and cards also.
Have you done anything to it recently?
I take it you get a successful POST beep on booting?
Try disconnecting all peripherals you don't need to boot (optical drives, printer, etc), and re-try. If that works, could be lack of power.
What RAM do you have? If more than one stick, try removing all but one.
Are the fans spinning?

 

Yes, it is the power supply, thanks!

 

Good show.