my psu doesn't shut down in power saver mode.

May 20, 2011 at 08:30:32
Specs: Windows XP pro
the hard drives shut down, and the monitor shuts down, but the psu stays on and continues to run the case fans. what could be the reason for this? is it the PSU or the motherboard? what can i do to fix this?

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#1
May 20, 2011 at 08:39:17
In power saving mode there is still some power going to the motherboard to keep the CPU ticking over and the memory contents live, waiting to spring back into life again.

If the PSU shuts down you have effectively shut down the whole computer just as if you had pulled the plug, the best power saving mode of all.

Stuart


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#2
May 20, 2011 at 09:09:34
i have 2 other computers that i use the power saver mode. after an hour the hard drives shut down and so does the PSU. then on one i have it set to wake with the mouse the other i have set to wake with the power button. both resume to the previous state when awoken. they do not reboot.
this computer does the same as the others except shut down the PSU. i'm wondering is it because the PSU is not capable of doing this or if there could be another reason.

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#3
May 20, 2011 at 09:40:47
Are you sure you haven't got the other computer configured to hibernate. That does shut down the PSU, after first saving the contents of memory to the hard disk. When it resumes it does a POST then recovers the memory from the hard disk carrying on from where it left off.

Once power is removed you lose the contents of memory, there is no getting around that unless the power supply itself goes into a power saving mode supplying just enough power to keep the memory alive which doesn't require fans to be running.

Only the more expensive power supplies will have this facility so I would check with the other computers to see exactly what is happening. Possibly this power supply does not have a power saving mode.

Stuart


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#4
May 20, 2011 at 09:46:24
Being that you don't list any specs of either your system or PSU, it's hard to determine what's going on. Could be your power scheme settings, could be your BIOS settings. As Stuart stated, you cannot "shutdown" the PSU, if you do, you will shutdown the entire system. If anything, the cooling fans may slow down or even stop, but the PSU is still on. There may be some sort of temperature sensing going on that's keeping the fans running.

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