Mac Pro Shuts down when sleep selected

My Mac Pro (Quad 2.8 - Early 2008) Locks up or powers off when I try to sleep the machine. This also happens during an automatic sleep, which I have since disabled. I got assistance from online tech support. We tried just about every routine procedure, but nothing helps.
The strange part is once the machine is powered off I have to wait about 20 minutes before I can turn it back on. Every attempt using the power button fails. So I have to let it sit for a while. I thought it was over heating, but the fans are working fine and very quiet.
Help needed.

I think it gets a little bit mental when we start talking about nano volts in power supplies. If these machines need a pristine supply to operate, then how have Apple managed all these years? This is a problem with the machines themselves (and even if it IS caused by domestic power supply, then the fault is still with the machines, as most folk don't live in these hermetically sealed biospheres that seem to be recommended). Mine just started doing the same thing. Other machines (Mac Pros, iMac and MacBook) are fine. Also odd that so many domestic power supplies across the world cause different people with the same machine to have the same fault.
I suspect it's a dodgy card. Perhaps corrupted system preferences, but given the number of folk with the problem (why does that always get ignored in favour of assuming all incidents are separate?), I suspect a hardware issue.
I've tried the 'unplugging everything' routine, but the fault returns. I'll try the 'unplugging everything for a day' routine - as mooted - and see what's what. But I suspect a trip to Apple is on the cards. I'm running Disk Warrior at present, to what avail I'm unsure, but I'll update my progress here.

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Well I have a variation on what others are experiencing with their machine.
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2- I let it sleep at least a few minutes…
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Hey,
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I have the latest battery update, so this should not be the issue here..
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Hi.
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regards
< Personal Information Edited By Host >

new log if anyone have any ideas what seems to be the problem.

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