Hi, I just recently recieved an M285 Core Duo T2500 2.0Ghz Gateway Convertible, and, like many of you, noticed that damn noise. Now, many of you recomend using RM CPU Clock and checking: "Run HLT command when OS is idle (restart required)", on the Management page, as an effective method of silencing the noise. It does work. However, battery life takes a hit. As I have gathered from Apple MacBook blogs, the noise comes when the processor switches power states, between Hard C4 (battery power state) and all other states. I knew RMClock was the tool but didn't know how to use it until tonight. The above "Run HLT..." option works because it takes the CPU out of the Hard C4 state(battery), you can see Task Manager @ 100% (because RMClock idles instead of Windows), thus reducing battery life noticiably. Instead, use these settings: Management page: unckeck: "Use OS load-based management" uncheck: "Run HLT command when OS is idle(requires restart)" check: "Restore CPU defaults..." - both options select: from the "CPU defaults selection" drop-down menu: "CPU-defined default FID/VID" Profiles page(if you know what ur doin'): for AC power choose Maximal Performance profile and, under AC tab, check "Use P-States..." and "Use Throttling(ODCM)", use index #6 for both. for battery power choose Power Saving profile and, under battery tab, check "Use P-States..." and use index #1, unckeck "Use Throttling(ODCM)", or, alternatively, use "Performance on Demand" profile and check nothing. Advanced CPU Settings page: Processor Tab: uncheck: "Enable Thermal Monitor 1" (makes CPU jumpy when it gets hot, that's why there's TM2) check: "Enable Thermal Monior 2" (replaces TM1) check these Enhanced Low Power States: C1E, C2E, Hard C4E. Platform Tab: check: "Enable Popdown Mode" THE MOST IMPORTANT!! uncheck: "Enable Popup Mode" That last one is the most important as it's the one that silences the noise! All of the other ones where just to preserve battery life and keep everything safe if you exit RMClock. You can also check: "Run application automatically when Windows session starts" for hassle-free power management (tho' it seems to keep working after you exit!). Press "Apply" and ur done... but wait, these settings, if improperly set, may heat up any computer, so, please, do it at your own risk. I'm a computer engineering student and know my way around, more or less, but it works and preserves battery, on my Core Duo T2500 2.0Ghz with BIOS version 78.03, haven't tested it with newer 78.04. Also, it pumps it up on AC power, without too much heating or jumpyness after long standby. Hope it works for other Core Duo users and even Pentium M, and I hope I was clear enough. I wish I could keep experimenting and try to get more life out of battery but it's 5:30am and I'm tired. @ least, I don't have the whinning anymore and have more than 4 hours of battery life If you try please reply and give your opinion. if it works or not.