MacPro running Tiger 10.4.11 reboots every time after waking from sleep mode

Whenever I wake my MacPro from sleep it now reboots as though it was shut down completely. This worked fine last week and only started happening yesterday. Any advice appreciated. Thanks.

Try a PRAM reset:
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Excerpt from: http://support.apple.com/kb/ht1379

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