Mac Pro won't start and display has no signal?

My Mac Pro goes to sleep and won't start. The display doesn't have a signal. What is wrong?

After a few hours of trying to work things out...I've discovered its related to the ATI Radeon 2600 HD XT Card (dual cards and monitors). Once I remove one card from each machine the systems started but the monitors remained in what looks like suspended mode display "No signal".
Tried to download firmware update. My system wouldn't allow the installer to work. Apparently already have the firmware.
The Display icon shows only four choices for the monitors resolution. On my working systems there are at least 15 resolution settings. Where is the ATI Radeon software on the system. The About this Mac doesn't show any Graphics or Display information.

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