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Can't find reason for Windows 7 Auto Shutdown

Last year I somehow created an automatic shurdown at 11:30 p.m. for a client's Win 7 Pro PC, and now I can't remember what I did!

I need to stop it from shutting down automatically at the customer's request. I looked in the task scheduler, where I would have thought I would have created a call to shutdown.exe, but no such task exists.

So my bottom line is that I can't figure out how to undo my own auto shutdown. Crazy, I know! Can anyone tell me what to look for?

Thanks!
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LeeTutor
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No, neither of these were done. Just to make sure I did a search for all .bat files.

I'm baffled by this. Again, normally I would do it in the task scheduler but I just don't see the task listed. Same user, admin privileges.

Any other ideas, anybody?
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No, it wasn't a program.
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I'll try your suggestions.

Interestingly, there is a "sister" machine right next to that one (same OS and same basic setup) that DOES INDEED show the "Shutdown" task that I created for that one at 11:00 p.m.

So I have one computer that shuts down at 11:30 and does not list the task, and another computer right next to it (they are in a 2-computer workgroup) that shuts down at 11:00 and DOES show the task!

I decided to disable the task on the 2nd machine.
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Just did the search and nothing came up for 11:30, tried again with 11 and two unrelated tasks came up.

So the indication is that the task does not exist!

I need to try to stop the PC from shutting down tonight (because the client just went away on vacation and wants to access it with Splashtop Remote on their iPad - Tested out perfectly yesterday), and if it shuts down I might not be able to restart it remotely (only if BIOS allows).

I was thinking of trying to bypass the shutdown in one of two ways:

1) Rename "shutdown.exe" to prevent it from running.
2) Create a new task (if possible) to RE-START (instead of shut down) at 11:28. This could conceivably prevent the shutdown command from having any effect.

In other words, the computer would be engaged in the process of rebooting while the "shutdown" command was supposed to execute, thereby rendering it ineffective.

Any thoughts on those possibilities?
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It's not a server, rather a Windows 7 machine.

This attempt at a fix is a one shot deal because the client went away on vacation today and the machine is scheduled for a shutdown at 11:30. Once it shuts down I will have no access to it until she returns in a week. She was hoping to be able to access this computer via her iPad remotely, and that will be impossible if the machine shuts down.

I suppose I could knock the clock back in order to buy some time.

Not sure if Wake on Lan is enabled in BIOS, and can't check because I have no access to the site.
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I set up a test run on my Win 7 box here. I set up a hard time for shutdown and tested it. Then I set up a restart one minute before in order to interrupt the shutdown. It worked. I got a simple reboot and there was no problem. I just implemented it on the client's machine remotely, and I will report back tomorrow whether it worked or not. Fingers crossed. Thanks for the help! More tomorrow...
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McKnife,

All good idea. Points awarded, but I ended up having to implement that automatic reboot in order to overlap the shutdown. It works fine. I'll look into it more when I end up on-site. Thanks for the help!