MDD will not boot up

Hello I am looking for some answers. When I press the power button, the computer chimes, screen turns on and I see the grey screen with the black apple and below it there's the rotating dash mark Wheel. And I also hear the fans . Then after a minute a circle with a line through it replaces the apple. It doesn't matter if its the hard drive, a system disk or original software disk same results. Used the original disk for the hardware check, everything passes. I reseted the PMU, Nvram, Left it unpluged overnight, changed the battery with a good one. I also read the posts of others that had a similar problem and tried what others recommended, no luck. The more I think about it, I think the motherboard maybe at fault.

There many things to try.
I do not think it is a hard ware issue. I have gotten the "NO" sign before. The same symbol that is used for "No smoking."
It is called a "broken folder" or prohibitory sign. It appears during startup.
Note: The prohibitory sign replaces the "broken folder" in Mac OS X 10.2 or later.
A kernel panic occurs during startup.
A miscellaneous startup issue occurs.
Having had some silly issues myself, and nothing better to do this weekend. I found many things that you can do to get your Mac healthy.
Try starting the computer in safe mode, Hold down the Shift key immediately after the startup tone, and release when you see the progress indicator (looks like a spinning gear). Use disk utility, repair permissions
(always unplug the computer and touch the power supply. ESPECIALLY if you have ever experienced any static discharger in your home)
One of the more interesting ones was:
Take out the battery, hold the power button on for 30 seconds, put the battery back in. Push the button on the mother board while your in there.
Plug the computer back in and reset the PRam. Turn the computer back on and immediately press and hold Command-Option-P-R until you hear the startup sound for the second time. Keep holding the keys and let the computer restart 2 or even three times.
Make shure your firmware is up to date. Go to Apple downloads.
Boot from an external FireWire device with a good system on it.
Boot from your tech tools CD if you have Apple Care.
Rebuild permissions.
OR..WORST CASE. Go purchase a NEW harddrive. Pull out your old one, or disconnect it.
Start up your computer with the new drive attached. You should get he "Question Mark" sign. Insert your System disk and format the new drive. Do all the updates.
MAKE SURE YOU CHOOSE YOUR SYSTEM USING START UP DISK IN SYS PREFS
Shut down your computer. Plug your old HD back in start up from your new hard drive. If the old drive shows up, repair permissions. If not, use Disk utility and try to repair it.

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    Quote
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    Quote
    Does the problem persist when you use Silicon RAID instead Nvidia RAID?
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