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When I select Start->Turn off computer->Standby the 'turn off computer' option window closes, and then nothing else happens. I can start new applications, and Windows acts like I never selected standby. I ran it for several hours after that. If I have a TV program scheduled to record when I select standby I get a window (the Pinnacle TV software) asking if I'm sure, there are programs scheduled to record - and the computer just keeps running after I select yes, never going into standby. I added that detail as it shows the standby process is starting. [This problem also happens if a TV program is not scheduled, so the scheduler task in not running/in memory. This problem happens regardless of whether I'm not watching TV. This problem happens regardless of whether Media Center is running (it usually isn't, I'm using Pinnacle to watch TV).]

I looked at "How to troubleshoot hibernation and standby issues in Windows XP" - ACPI is enabled, and "standby" is an option in "Power Options Properties." So it appears to be setup correctly.

Windows XP SP3 Media Center Edition, all current updates installed.

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Can you provide some technical specs on your computer, especially the motherboard make/model. If it's an older motherboard, it may not support Standby mode. – BBlake Apr 19 '10 at 17:35
The computer was brand new in 2008... The link I quoted above says if those things show up as option then it's supported and set up correctly. – Carl Apr 19 '10 at 20:23
The motherboard is a Gigabyte GA-MA78GM-S2H, the processor is an AMD Athlon Dual Core 4850e, 2.51 GHz. BIOS = "Award Software International, F8, 6/3/2009 SMBIOS Version 2.4." It's a desktop. – Carl Apr 19 '10 at 21:00
WHY DID YOU EDIT MY TITLE, quack quixote - I DON'T HAVE A DVR! What is HTPC? – Carl Apr 20 '10 at 15:32
@robert: i changed "tv" to "htpc/dvr" -- "htpc" is "home theater pc", "dvr" is "digital video recorder", both are used to refer to computers configured to play/record tv video. – quack quixote Apr 22 '10 at 4:43
up vote 1 down vote accepted

I solved this through trial and error. Killing MagicJack (internet phone) solves the problem.

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I may not be back in two days to mark this answer as accepted - it says I have to wait that long. – Carl Apr 19 '10 at 21:26

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