As you'll know, Windows is pretty terrible regarding providing any information as to what might be preventing standby. I've checked no devices are set to prevent it (of course, if they were it wouldn't work sometimes anyway). If I do powercfg - requests it shows:
C:\Users\MediaPortal>powercfg -requests DISPLAY: None. SYSTEM:[DRIVER] \FileSystem\srvnet An active remote client has recently sent requests to this machine. AWAYMODE: None.
but I've used the tweak to set "Enable standby with remote opens" in Power Options and powercfg -requestsoverride shows:
C:\Users\MediaPortal>powercfg -requestsoverride [SERVICE] [PROCESS] [DRIVER]\FileSystem\srvnet SYSTEM
I had LogMeIn installed, which has an option at install to "Prevent standby when AC power is available". I'm not sure how it enforces that, but I unticked it anyway so that shouldn't have been a problem but I've completely uninstalled it now anyway, due to problems with it's mirror driver disabling Aero and not re-enabling it after disconnecting. I now have TightVNC installed which uses a mirror driver but that does re-enable Aero when disconnected. I don't think that can be anything to do with the Standby problem anyway.
This post has been edited by doveman: 02 July 2012 - 05:47 AM