Mac Pro 2006 wont boot up, no video...

Hello... I have a Mac Pro 2006 and yesterday, it froze up and I had hold the power button down in order for it to turn on, since it was unresponsive... Upon trying to restart the Mac, it just hung at the white screen with the apple logo, and I realized I had a Mac installation cd in the drive, so I figured it was trying to load it. I used the eject button on the keyboard, but the dvd wouldnt eject, so I took the side cover off of the Mac Pro, and manually ejected the dvd... Then I tried to reboot the computer. This time when I tried to boot the mac without the OSX installation dvd in the drive, the computer didn't boot up, my monitor wasn't getting any signal, but the fans, drives and everything still sounded like they were running as normal and the dvd drive still ejects manually... I used the diagnostic lights inside the Mac, and the 1st light is showing trickle power, the 2nd and 3rd lights are red immediately after I press the power button, 4th and 5th aren't lit, the 6th is flashing green, and the 7th is a solid green... The 6th light flashes green whether or not my video card is plugged into a pci slot or not... I have tried booting the system without anything connected, drives, mouse, keyboard, anything and I still get the same lights... Please help... I was wondering if it could be too much thermal paste on the cpus or something of that nature...

Make sure your Ram is paired correctly when you install it --
And the long boot time is due to the previous reply. If you don't set a 'boot drive' the mac pro will look everywhere before selecting the OSX installation.
I've got the dual 300GB Velociprators in raid 0 with 80GB Intel ssd boot drive in my mac pro (same as yours). You can also boost your clock speed by a software trick .. I can get mine over 2.9 MHz before errors start popping up in console.
(problem is it screws up video playback and time)
http://www.zdnet.com/blog/apple/overclock-a-mac-pro-or-xserve-in-software/1910?t ag=content;search-results-rivers

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