My Mac Pro tower quad core crashed and is showing a NO sign (the circle with a slash through it). How do I safely get it to come back up ? Model A1186

My Mac Pro tower quad core crashed and is showing a NO sign (the circle with a slash through it). How do I safely get it to come back up ? Model A1186

General purpose Mac troubleshooting guide:
Isolating issues in Mac OS X
Creating a temporary user to isolate user-specific problems:
Isolating an issue by using another user account
Identifying resource hogs and other tips:
Using Activity Monitor to read System Memory and determine how much RAM is being used
Starting the computer in "safe mode":
Mac OS X: What is Safe Boot, Safe Mode?
To identify potential hardware problems:
Apple Hardware Test
General Mac maintenance:
Tips to keep your Mac in top form
Troubleshooting: My computer won't turn on
https://support.apple.com/kb/TS1367
Where are your bootable backups and clones stored?
What do you have to boot from to restore or attempt to recovery files that are not backed up?
It won't be a PowerMac. People tend to think they look alike? or mean the same thing.
http://www.everymac.com/systems/apple/mac_pro/specs/mac-pro-quad-2.66-specs.html
Try zap PRAM and SMC Reset. If you have ATI 5770 which many have upgraded to you won't be able to use older DVD or systems than 10.6.5

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