T500 - Intermittent Boot Hang and not able to Reboot

Hey folks.  I have a Lenovo Thinkpad T500 (2242-35U) here that is having a bit of trouble.
First off, its very intermittent to get it to boot.  When I press the power button to start it, it goes through its regular post, and then right before it should start booting off of the hard drive or dvd drive, it hangs with just the blinking cursor.  Trying different boot media like a hard drive, bootable cd/dvd disk or even a bootable usb stick all result in the same.
However, once every 5-6 times, I get lucky and it starts to boot.  Once I was finally able to boot off of a bootable diagnostic cd, I ran hardware checks, and it appears that everything checks out.
Another issue with it is that it doesn't do a reboot properly.  No matter if i'm into the operating system doing a Restart option, or at the boot hang mentioned above, pressing Ctrl+Alt+Delete, the screen goes blank and it stays there until I forcefully power off and power back on.  Even during my install of the operating system, when the setup reboots several times, i've had to forcefully power it off, and then try numerous times to get it to boot back up again.
I just installed a fresh copy of Windows 7 x86 enterprise, and updated the bios to its latest version, doesn't appear to change anything.
The unit is currently out of warranty.  Is there anything else I can try with this?  I am an authorized service provider for Lenovo, I just don't know where to go to from here, and any suggestions would be welcome.
Thank you.

Alright, got a chance to test it more over the weekend...
- I went into the BIOS, and disabled everything I could find.  Even went as far as pulling the hard drive back out again and the optical drive, and tried booting from a USB stick.  Exact same issue, took a bunch of tries for it to finally boot.
- Enabled just the essential stuff I would need on the laptop, same issue
- I don't see any mention of Turbo Memory in the BIOS or product page for this model, so I will assume that it does not have it.
I guess the problem is something with the motherboard.  But, at over a couple hundred dollars, I don't think its really worth the money to replace it at this point seeing that the notebook is still completely usable, once it boots .
Thank you all for your help and suggestions either way.

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