Mac pro boots without apple logo..

Hello,
I have a MAC PRO 2008, and it boots without a grey screen and apple logo.
If I turn on de mac the screen does not go on, after a 10 a 15 seconds the OS is starting up, screen pops on and have no isseus with the MAC pro.
I tries to reset the smc and Pvram, but problem still there.
I tried other videocards, displays, press the reset buttons in de mac etc..
Anybody knows what is the problem of this no boot screen?

you either bought it used with a PC video card or upgraded yourself, as Illaass pointed out, not realizing the difference or what EFI firmware on a graphic card vs not. And some GPUs have a switch to allow legacy PC mode or UEFI.
Oops! see there were updated replies... just ignore.
Try MACVIDCARDS
FAQ about using off the shelf Nvidia: http://forums.macrumors.com/showthread.php?t=1440150
There are other threads, and forums, about using AMD cards.
OSX and Graphics Cards

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