Mac pro maverick suddenly sleep whilst in use

Hi
I have a Mac Pro currently using Maverick software OS X 10.9.4.
Two days ago I took it in to the apple store to get the hard drive replaced and now my laptop suddenly goes to sleep whilst in use.
I tried clicking the track pad and the keyboard to wake it up as usual but it remains on sleep mode.
Eventually after a good 15 minutes the display will come back on itself.
Can someone suggest a solution?
Thanks

Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
If this does not help, you have to take the computer to the Apple store to have it checked again.
Best.

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My Mac Pro used to be able to go to sleep by setting
the Energy Saver settings to automatically sleep
after so many minutes. It no longer sleeps at all on
it's own. Lemme explain.
If I put my computer to sleep with the Apple Menu, or
Power Button or any other manual method of sleeping
my computer, it works but, if I leave it to sleep on
it's own only the screen will go black. When I move
my mouse, the screen will instantly come back on as
if only the screen was sleeping. I know what a normal
sleep sounds like... I'd hear a few clicks and hard
disk spin downs and then my screen would go black
but, it does not do that.
To prevent a bunch of people asking the "Have you
tried...?" questions, I'll go ahead and list the
things that I have already tried and failed.
1. Repaired permissions
2. Unplugged any external gadget (USB and FireWire)
3. Tried a brand new user
4. Tried Restarting (Hey, couldn't hurt to just
Restart)
5. Checked for weird login items (Only EyeTV Helper
which has been there the whole time even before the
sleep problem)
6. Made sure my software was up to date (latest
security and OS Updates)
7. Booted into "Safe Mode"
8. Checked Activity Monitor for any strange processes
running
9. Checked for scanner software (Couldn't find it)
10. Tried switching the Mighty Mouse to the right
keyboard USB port
11. Tried un-mounting all hard drives (except for
boot drive)
I can't think of anything else to try. I can't
believe that Safe Mode or a new user couldn't clear
the problem. Has anyone else had this problem?
I'm running Mac OS 10.4.9 on a Mac Pro with 3GB of
(working) RAM and 3 internal SATA hard drives and 2
internal SuperDrives.
Reset PRAM
Trash this file:
/Library/Preferences/System Configuration/com.apple,PowerManagement.plist
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Hi ..
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Wow, who are you dealing with? The first time my logic board was replaced, the techs never bothered with looking at anything else as being the problem. However, when I pointed out the power supply fan problem, they focused on that being the cause of the problem and fixed just that. I was somewhat concerned as I know some of these techs do not look at other parts of the machine as potential problem causers. I was afraid that I would hook up my system only to experience the same problem as before. Luckily, that was not the case.
I am glad that your system appears to have the same problem as mine did. I would suggest that if you take it back to them again for a fan fix to have them run the system for about an hour after replacing it. They should be opening apps, checking the iStat widget, etc to try and make it break. If they can't after an hour or so, I think it should be ok.
This whole ordeal makes me question the quality of parts used by Apple. My brother has an iMac G4 where the hard drive died after 2 months of getting it new. Now this issue with mine and yours with the bad logic board and the power supply fan. Who knows how many other customers report hardware related problems?

Mac pro maverick suddenly sleep whilst in use

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