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• Have completed full spyware/malware/antivirus scans....all clean.
I have the Power Options on my computer set so that it's supposed to go into Standby mode after 2 hours of no activity, but it's not working. It used to work, so I'm a bit baffled about why it may have stopped. Any ideas?
It could be anything from the bios to open programs preventing it from kicking in.
Start simple, exit every possible process you can and try stand by after 1 minute.
Also, what kind of mouse and keyboard do you use? Are they wireless?
Thanks for responding. I haven't made any changes to my bios, and I don't think anything unusual is running in the background...except jqs.exe, which I know is the Java Quick Starter. Could that be doing it? I'll definitely try your suggestions and let you know what happens.
The mouse and keyboard are both standard, not wireless...they're the original ones that came with my computer.
Usually, but not always, this kind of problem is due to the installation of a new device driver. In order for the system to go into S3 sleep mode (standby), ALL of the devices on the system, from the graphics controller to the memory controller require drivers that support standby. If a single one of them doesn't, then the system will stay awake.
In my experience, the system (depending on the OS) will usually issue a message saying which driver is preventing it from going to sleep.
Have you installed or updated any drivers recently?
I'm not getting any message telling me which driver is preventing it from going to sleep.
You're picking my memory here. The only driver I remember updating was for my video card. BUT...I rolled back to my previous driver because I didn't like the changes that took place with the updated one. But I used this previous driver before and didn't have any problems.
Ultimately, this isn't a big deal for me. Just a minor annoyance, because I sometimes leave the computer on in the evening when I go to watch television - but if I fall asleep, I just want to be sure the computer isn't running all night. That isn't often, but it does happen. I'll figure it out somehow.
Might be software you recently installed? I know one game I have if it's open the computer won't go to sleep if it's fully open. If it's on the task bar it doesn't effect it.
Wasn't mentioned specifically but if that mouse is a laser mouse try flipping it upside down. I know the one I had was very sensitive to anything, walking into the room would set it off sometimes.
Might be software you recently installed? I know one game I have if it's open the computer won't go to sleep if it's fully open. If it's on the task bar it doesn't effect it.
Wasn't mentioned specifically but if that mouse is a laser mouse try flipping it upside down. I know the one I had was very sensitive to anything, walking into the room would set it off sometimes.
Actually, it's funny you mentioned the mouse. No, I don't have a laser mouse connected (though I will be soon) - just a standard ball mouse, but I have been known to put the computer on standby and flip my mouse upside down because the slightest movement would wake up the system. Even a slight bump to the desk would wake it up. That's why I started using hibernate instead. But I really don't think that's what is preventing it from powering down after the designated amount of time I've set in the power options.
As for other software I've recently installed....well, yes I have done that. Never thought it would be an issue, but maybe...? I'll look into it. Thanks!
I had this problem and solved it by removing Java Quick Starter: Run msconfig, services, then uncheck Java Quick Starter, restart.
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You're picking my memory here. 
The only driver I remember updating was for my video card. BUT...I rolled back to my previous driver because I didn't like the changes that took place with the updated one. But I used this previous driver before and didn't have any problems.
