If this is a non Mac edition or Apple card, this is normal until OS X boots up. You will not get an image at startup if it does not have an Apple or Mac Edition ROM.
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If it's an Apple card, this should not happen.Try new monitor(s) and try again. If it goes away, it's the monitor.
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If it still happens,check if the card has PCIe power plugged in. If not, find a cable and plug it in to get the card working. If it has PCIe power plugged in, it's a bad video card and you will need to replace it.
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If your card doesn't have an Apple or Mac Edition ROM, the system won't show an image until OS X boots - this is normal. This is not normal on cards with an Apple or Mac Edition ROM. It's possible to flash a ROM to some of these cards, but this will void the warranty if you RMA it with the custom ROM flashed.
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If you have verified you have a Mac Edition ROM or Apple ROM card, try using a different monitor. If this works, then you need to replace your display. If it still happens, check if the card requires PCIe power and if it's plugged in. If it does and you don't have the cable, you will need to order this. They generally aren't expensive and are easy to find.
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If your card is hooked up and you have verified your card has the correct ROM and has PCIe power, you will need to replace the card.
The first thing you need to check if this is an Apple ROM card, or a PC card. Non Apple ROM cards will show blank at startup, but work when they are at OSX. This is something that seems to happen a lot more then it should, and people think the card is bad. It's fine. It's just not running an Apple ROM.
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If you have determined it's Apple ROM(or flashed), try another known good monitor with the same cable. If it doesn't work, try a new cable on the old monitor first, and then the known good one.
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If both monitors are blank, it's the card. You need special power to it, or it's failed.
+
If this is a non Mac edition or Apple card, this is normal until OS X boots up. You will not get an image at startup if it does not have an Apple or Mac Edition ROM.
+
If it's an Apple card, this should not happen. Try new monitor(s) and try again. If it goes away, it's the monitor.
+
If it still happens, check if the card has PCIe power plugged in. If not, find a cable and plug it in to get the card working. If it has PCIe power plugged in, it's a bad video card and you will need to replace it.
It's either the video card has a issue or the monitor
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Try a new DVI or VGA cable and see what happens, and if this doesn't work, keep reading
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Next you want to try a alternative monitor, and since most LCD TV's have a VGA input, you can get a VGA cable and DVI to VGA(if needed), and rule out your monitor being bad; if it works on the TV, bad monitor
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If not, it's your video card
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However, if you have a dual DVI Mac Pro video card, you can try another DVI port and see if the problem lies with that DVI port in use before or it's really the card
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The first thing you need to check if this is an Apple ROM card, or a PC card. Non Apple ROM cards will show blank at startup, but work when they are at OSX. This is something that seems to happen a lot more then it should, and people think the card is bad. It's fine. It's just not running an Apple ROM.
+
If you have determined it's Apple ROM(or flashed), try another known good monitor with the same cable. If it doesn't work, try a new cable on the old monitor first, and then the known good one.
+
If both monitors are blank, it's the card. You need special power to it, or it's failed.
It's either the video card has a issue or the monitor
+
+
Try a new DVI or VGA cable and see what happens, and if this doesn't work, keep reading
+
+
Next you want to try a alternative monitor, and since most LCD TV's have a VGA input, you can get a VGA cable and DVI to VGA(if needed), and rule out your monitor being bad; if it works on the TV, bad monitor
+
+
If not, it's your video card
+
However, if you have a dual DVI Mac Pro video card, you can try another DVI port and see if the problem lies with that DVI port in use before or it's really the card