I had a look on some other treads and came across this, could be worth a try i guess
Generally, computers have the capability of having the computer hardware (BIOS) control power management and/or Windows control power management. Check your computer CMOS to verify if Power Management is enabled within CMOS. If enabled and the computer is not going into Power Saving / Standby mode, attempt to disable Power Management in CMOS and follow the below steps for reinstalling the APM drivers in Windows.
Corrupt APM (Advanced Power Management) drivers.
Click Start / Settings / Control Panel / double-click the Systems icon / click the Device Manager tab / click the + next to System. If the first device is not Advanced Power Management support, skip to the next paragraph. If Advanced Power Management support is present, highlight and click the Remove button to remove it from Device Manager. Once removed, reboot the computer and let it reinstall and try power management again.
If Advanced Power Management was not listed in Device Manager or once removed was not reinstalled after rebooting the computer, click Start / Settings / Control Panel / double-click on Add new hardware, and let Windows detect and install new hardware (should detect and install Advanced Power Management support). If Windows does not detect Advanced Power Management support, verify in CMOS that Power Management is Enabled.
Another possible solution