PC Wont shut down

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Hi guys, So on my system I have been having a problem for about a week or so. When I goto shut down the monitor goes off and the mouse as per normal, but the tower won't turn off. I have tried a system restore and also scans and such but no luck there. I have tried updating the bios and also clearing the CMOS but again still won't turn off. The only way I can get it to turn off it by holding the power button. Anyone any ideas?
 
Just looking through windows updates to see what ones have been installed recently incase thats involved and theres only 2 been installed in the last 2 weeks, they are both security updates for IE11 so pretty sure that isn't my problem.

Ok I found a page on the web telling me how to check the shutdowns and its saying its shutting down properly every time even though its not. Any other ideas please guys?
 
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What motherboard and version of windows mate?

For Windows 7 you can try this..

Go into the windows control panel and the device manager to the tab for IEEE-1394 Bus Host Controllers and click the tab to expand it then right click for properties and under power managment click "Allow the computer to turn off this device...."
 
Motherboard is the Asus Z68 V Pro and windows 7 64 bit mate. Will try that now thanks.

Just tried that and no luck :(. Tried looking for updated drivers and changing security suite too with no luck. Strange problem because it restarts fine and no other issues at all. I appreciate the advice mate.
 
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Still messing about with this. Just found out that if I put it to sleep or hibernation they work fine, so I am truly lost with this one. Ok I give up now, I have tried all sorts. Reinstalling all drivers, system restore, sfc scanow/chkdsk , safemode ( still doesnt shut down ) , tried shutting down with only the mouse plugged in, tried shutting down with my other ssd/hdd unplugged, ran malware scans , tried unticking load startup items and hide all microsft services in msconfig, tried removing all recent windows updates, checked event viewer as already mentioned above. I am starting to think this is hardware related.
 
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Yeah have tried that and it does the same thing mate, the screen, keyboard and mouse all goes off as normal. The pc makes this like click noise like it always does when its about to go off, but it then stays on the tower. Just cleaned inside my pc and checked all cables and connections. No luck yet finding out a fix.
 
I had a search around and found users who had Bios issues with SSD, are you using a SSD and is it set in bios as ACHI?

If it is set as IDE it can cause issues.
 
I did that guide last night yeah. The only thing I haven't tried is a clean format on windows. I only did a fresh format a month ago but might have to do another if I can't get to the bottom of this. Thanks for the help though mate i appreciate it.
I am getting no other problems at all, the system is smooth as can be so it's difficult to explain this.
 
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It is sounding more like hardware, might be worth removing a piece at a time RAM, GFX card hdd's etc to see if any make a difference.

These sorts of issues are annoying and time consuming :(

Did you try a shutdown start > run "shutdown -f -s -t 0"
 
Well I have already tried different ram and gpu with no luck, I can't try the others as I don't have replacements. If it was serious surely I would know about it and get crashes or BSOD or even error reports, but I get nothing. It could just be windows related as most things are but I won't know till I reinstall I guess. I tried that command earlier mate yes after finding someone talking about it on youtube lol.
I just shutdown the pc, left it for 2 minutes with the monitor, keyboard and mouse all off obviously. The tower stayed on but the odd thing is after the time I left it off I pressed reset and it still reset windows and the monitors etc came back on !!! Just as if the pc was never shut down.
 
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I had this a while back on my old Vista PC, I used Glary Utilities and did the 1 click maintenance which sorts out all sorts including a registry clean up etc...
All I can say is... It worked for me.
 
Strange thing I just uninstalled all my drivers again and then updated them with Driver Reviver and now the PC shuts down again. God knows why it wasn't shutting down after I updated them the first time round but its sorted now thank god. Thanks for the help lads.
 
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