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If I switch on my laptop and start using it after about an hour it gets that hot that it cuts out automatically. From the start the fans run ok and it expels quite a lot of heat from the vents.
However if I put the laptop into standy mode rather than shut it down, when I switch it back on it does not run nearly as hot. The fans take a while to come on and it runs fine for as long as I need to use it.
Bizarre????
Your pile of tissues is too close to the vents?
is it a '2-step' processor?
possibly it's starting in 'low power/battery' mode from standby and generating less heat as a result?
Try cleaning the dust out of the fan
Explain or fix?
Laptops tend to get full of dust and fluff, which impedes air flow and stops heat sinks working efficiently. The fix is to blow the dust out with a can of compressed air. On my Dell, the whole of the bottom of the case comes off, making it a cinch to do this; on most others I've seen, getting proper access to the innards is more tricky. You can still blow dust from the vents but it's less effective (you're blowing dust in as well as out).
As to why, I dunno. Hibernate can do some very weird things to power management and ACPI, why it would work [i]better [/i]after hibernating though, god only knows. Look for a BIOS update perhaps?
possibly it's starting in 'low power/battery' mode from standby and generating less heat as a result?
Genius. SpeedStep could be bringing up the CPU in low power mode. *applauds*
Could be other devices too. The HDD might be in a power-saving mode, network adapters disabled and so on.
Have previously tried to stop the heat cut out problem by vacuuming out dust and adding fresh silver paste with no effect so I am fairly sure it is not a dust problem. I think it is some sort of processing issue.
Its an AMD64 athlon processor running windows XP
BIOS update, chipset drivers...?
nd adding fresh silver paste
No offence, but do you know how to do this reliably?
Might not be the CPU that's overheating anyway, could be the GPU or Northbridge or something. Assuming your board supports it, it might be worth looking at some sort of thermal monitoring.
I'd be querying "when the fans run, it overheats; when they don't, it doesn't." That doesn't imply that it's a cooling issue, that implies that it's not working as hard. How's the performance in both cases? What happens if you do something intensive (like a game) post-hibernate, does it spin up again?