P7-1446s powers on but does not boot (no video output)

Hi everyone, I've got a tricky issue with my p7-1446s.
Specs: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03500676&cc=us&dlc=en&lc=en#N90
Was running 8.1 at time of death.
The fans spin, the power light in the back is a solid green, and the disc drive opens and closes.
The backlight of the front on/off button does not turn on when the PC is powered on (it's typically backlit green for active use or orange for sleep). This button will power the PC on, but doesn't turn it off.
I've tried multiple monitors (DVI and VGA), unplugging the hard drive and starting with a boot disc in the drive, and plugging in a video card, to no avail.
I'm getting the impression from solutions to similar problems on other computers that this is a this is a CPU or motherboard issue - is this something reflowing could solve?
Thanks,
Dan

Hello dmj53,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand your computer is getting power and yet not starting. I am providing you with an HP Support document: Computer Does Not Start and Emits an LED or Beep Code that should be able to help you identify what is going on with your computer. If you are not getting any flashing lights or beeps then I would thinkit would be best if you contacted HP technical support for repair options.
US support link to contact options for HP products purchased in the US.
Outside of US support link to contact options for HP products purchased outside the US.
As your computer is not that old and may be yet under warranty. I would like to thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
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"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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