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- Power Down and Stanby problems
April 3, 2007, 5:30 pm
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powering down it boots itself back up again.
When put in standby it shuts everything down except the fan.
Anyone have any ideas how I can fix it so that it powers down ok and
fix it so that the cpu fan stops on standby?
What would be the power consumption if the pC is kept in Standby
instead of powering it down.
Would it harm the PC to keep it in stanby with the fan running?
Re: Power Down and Stanby problems
I cannot help with your first problem.
Your second problem ("fan runs in standby") suggests you are
in S1 state. ACPI power states go from S1 through S5. S3 is
the one to use, for standby. S3 is "Suspend to RAM". In the
S3 state, the CPU fan goes off. The CPU loses power. Peripherals
have no power. The only power running in the computer in S3, is
the +5VSB rail. The +5VSB is used to continue to power the sticks
of RAM on the motherboard. Depending on the brand of motherboard,
you might also see a green LED glowing on the motherboard, which
tells you that +5VSB is still present. (Never add or remove component
in the computer, if the green LED on the motherboard is still
Try a google search for "dumppo.exe". That is a tiny program,
which is downloadable from Microsoft. Dumppo can tell you what
current S states are supported.
You could go into the BIOS, and check the S states mentioned there.
If there is an "Anto" option or an option for S3, you could play
with that. Then, boot back into Windows, to prepare for some
repair work with dumppo.
Dumppo has what is called "administrative override". By using
the right command line options to dumppo, you can cause the OS
to switch from using S1 to using S3. Then, the next time you
select "standby" in Windows, the CPU fan will go off, and the
only power used in the computer, will be to power the RAM which
is still holding the entire current session. (When the computer
recovers from standby, it has to reinitialize drivers and the
like, which is why it takes a few seconds to light up the
Most power supplies have a rating printed on the label, and the
+5VSB supply is rated at perhaps 2 amps or so. That means, while
in standby, the computer draws no more than 10 watts. The efficiency
of the power supply, making that 10 watts, could be as low as 50%.
Which means, if you measured at the wall outlet, the power draw
would be on the order of 20 watts (or hopefully, less). It is actually
difficult to measure the power of a computer in standby, and devices
like a "Kill-O-Watt" meter, or a clamp-on ammeter will have trouble
getting a correct reading. But it should be 20 watts or less, if
you manage to convince the operating system to enter S3 state
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