Why wont my Mac Pro Start?!?

Hello All
My Mac Pro (Early 2008) has begun acting strange. It wont power on.
I have done some trouble shooting (Removed all attached Devices (USB, ESATA, NETWORK,) Basically the only thing plugged in the rear is USB for keyboard / mouse and 1 DVI Monitor Hook up.
I replaced the power cable (Jug Cord), changed which wall socket the power plugs into.... but still it wont start.
A fix is to Pull Out the power cord from rear of MAC Pro, leave out for about 1 minute and then plug it back in. I hear it click and then it will start up once i press the power button. However once I Power back down, same problem.
Is this a faulty PSU? Or is there an internal Battery that could be causing problem?
I have tried removing the ram sticks also, same problem.
MAX OSX 10.6.8
2x4GHz Quad-Core Intel Xeon
10GB 800 MHz DDR2 FB-DIMM

Interesting, so putting a ATI 5770 means i cant boot from DVD? How come?! What if i need to re install OS from DVD?
Secondly, i was reading apple website http://support.apple.com/kb/TS3891
Mac Pro: Using ATI Radeon HD 5770 graphics card with Mac Pro released before 2010
Symptoms
You may notice display anomalies or issues playing back video or other HDCP-encoded content when you use an ATI Radeon HD 5770 video card in Mac Pro computers released before the Mac Pro (Mid 2010).
Resolution
The ATI Radeon HD 5770 video cards are supported only on Mac Pro (Mid 2010) models. They are not supported in earlier versions of Mac Pro. Learn more about graphics card compatibility for Mac Pro.
Then It says:
Graphics cards for Mac Pro (Early 2008)
ATI Radeon HD 2600 XT
NVIDIA GeForce 8800 GT (part number 630-9191 or 630-9897)
NVIDIA Quadro FX 5600
ATI Radeon HD 4870, offered as an upgrade kit
Note: The Radeon HD 4870 card requires Mac OS X v10.5.7 or later for use with the Mac Pro (Early 2008).
Can someone tell me, whats the difference between all the 4870 Cards?
This one is $130
http://www.amazon.com/Asus-EAH4870DK-HTDI-512MD5-Radeon/dp/B001KZOJCE
This one (refurbished yes) Is less than $50: Will this one work in my Mac Pro??!?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150594
I dont really have $200+ for a 5770 Card now.

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Why wont my Mac Pro Start?!?

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