Always in system idle mode. As in no activity at all, even when you are running games or something?
I know that newer CPU's actually shut down cores and/or underclocks when they are not needed, but nothing at all sounds a bit too much.
Power saving could also be the cd/dvd drive. Anyone hade a look at your BIOS l8tly? Could be just borked aswell. Tried putting a cd/dvd in it to see if it reads it at all?
I'd check if there's any updates available for your bios, could be a rogue power saving feature.
Also, check the windows power settings. See if it acts the same if you disable all power saving features, including things like putting the screen on standby, spinning down hard drives and all that. You might need to go through a few sub-windows to find them all, but if you save it as a new power profile, something like "No power saving", then make sure it's using that. It should at least tell you if it's something windows is doing.
If upgrading the bios doesn't sort it, and neither does changing the power settings for windows, it only leaves either faulty hardware (I'd say unlikely, given the nature of it, but can't entirely be ruled out) or third party software interfering. If it's still giving trouble, download hijackthis, and post a log of the open processes. There might be something in there that someone could spot that might be a possible cause.
Hope this is some help.
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