Black screen and can't wake up then

Hello,
I have a MacPro 1,1 (2006) 2.66GHz that it is always working as a home server.
After some time working idle the screen goes black. When I want to wake up there is no response. The screen turns into safe energy mode blinking his LED light power indication. I have to force shutting down pushing phisically the power button for some seconds.
What do you think about this strange behavior?
Graphic Card problem? I have another one but I don't test it for now.
I have made a PRAM reset and SMC reset shutting down the MacPro, unplug the power and push the power button for 10 seconds. No results at all.
Even putting Energy System Preference on NEVER (computer sleep and screen) after some time (2-3hours) the MacPro goes to black screen.
Any help will be appreciated! Thanks!

I had changed the fans of the X1900 with the AceleroX2 following the instructions on this website from xlr8yourmac.com: http://www.xlr8yourmac.com/Graphics/Mac_X1900XT_Silent_Cooler.html
It has been working with no problems until right now.
Probably even replacing the original fans of X1900 to AceleroX2 may be some dust on it. I will try to blowing it.
Thanks for your quick reply!

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