HP m9300t desktop will not boot

Hoping someone can help me out here.  I think my motherboard is shot but would appreciate some second opinions.  My HP m9300t desktop will not boot past the initial "HP Invent" blue splash screen.  On this screen, I have the options to enter Setup, Boot Menu, Recovery, or Diagnostics.  Normally, this screen will display for a few seconds then the PC will start to boot into Windows but that's not happening anymore.  Instead, it just hangs on the "HP Invent" screen.  If I attempt to enter Boot Menu, Recovery, or Diagnostics, nothing happens.  If I attempt to enter Setup, it will display a message saying "entering Setup" but the computer just hangs there and never does enter Setup.  I hear my fans spinning, I *think* I hear at least one of the hard drives spin up (I have two in the system), the blu-ray drive activity light blinks as it normally does when I turn the system on, but again, system will not boot past the HP splash screen.  I have tried booting from the Windows cd (no luck) as well as attempted to boot with all peripherals disconnected except keyboard and mouse and again, no luck.  I have noticed that the past two days the system has behaved somewhat erratically, locking up two times requiring a reboot but I just chalked that up to general Windows instability and/or my installing of some new beta software for a HDHomeRun cablecard tuner I just installed.  Looking back though, maybe those were some warning signs that my motherboard was on the brink of dying.  In any case, what I am thinking now is that the motherboard needs to be replaced but before I go out and buy a new one, I wanted to get other people's opinions in case I am overlooking something.  Thanks for any help that you can offer.

Marty, welcome to the forum.
Since the computer is over 3 years old, I believe that you have a failed power supply unit (PSU).  Here is a guide to help you troubleshoot the problem.
Please click "Accept as Solution" if your problem is solved.
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