in Windows 7 you can issue powercfg -requests from CMD prompt (running as Administrator)
Very cool !
Following on from that should something be found, it can be overriden,
-REQUESTS
Enumerate application and driver Power Requests. Power
Requests prevent the computer from automatically powering off
the display or entering a low-power sleep mode.
-REQUESTSOVERRIDE
Sets a Power Request override for a particular Process, Service,
or Driver. If no parameters are specified, this command displays
the current list of Power Request Overrides.
Usage: POWERCFG -REQUESTSOVERRIDE <CALLER_TYPE> <NAME> <REQUEST>
<CALLER_TYPE> Specifies one of the following caller type:
PROCESS, SERVICE, DRIVER. This is obtained by
calling the POWERCFG -REQUESTS command.
<NAME> Specifies the caller name. This is the name
returned from calling POWERCFG -REQUESTS command.
<REQUEST> Specifies one or more of the following Power
Request Types: Display, System, Awaymode.
Example:
POWERCFG -REQUESTSOVERRIDE PROCESS wmplayer.exe Display System