Mac Pro (SCREEN NOT WORKING)

Hi,
When i start mine mac pro, i hear the boooing sound, the fans are working too.
But only there is nothing appearing on the screen, SOMTIMES THE SCREEN WORKS AND SOMETIMES NOT ... i'm using a VGA>DVI connector for it mine model is :
Mac Pro (2008)
2.8GHz Xeon (Quad-core)
2GB PC2-6400 DIMM
32GB
Mac OS X 10.5.8
ATI Radeon HD 2600 XT
320GB 7200RPM SATA 3.5"
Model number: A1186
Anybody?
thanks in advance !!
greetz jagjit

The Analog VGA signal is generated by the graphics card, directly into the pins at the end of the DVI-I port on the computer. All the adapter does is shuffle the signals to get them onto the correct pins on the DB-15 (three-row) connector.
So as long as all the connections are good and no pins are bent, the display card itself (or possibly the display) is the most likely failure.
The Apple-firmware 5770 is a good replacement card for ALL models of Mac Pro. Accelerated operation requires 10.6.5 or later, so you would need to upgrade your Mac OS X version.
The other question is, how attached are you to that old VGA monitor? Are you sure it is still working correctly? How about a new digital display with better picture quality and higher resolution??

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