PC periferals stay on after system shuts down..

Got a question (not sure if this is the right place to post it but oh well)

Iv recently built a new system:

Thermaltake V8000A case (5 fans)
asrock 775 dual vsta
E6600
2 gb DDR400 ram
x1950 pro
250 gb seagate hdd
2 DVDRW drives
tagan 380 watt psu


It runs great, though iv got some issues with it.

Every time i shut my pc down, everything shuts down as they should, except for my modem and my mouse. They still have power going to them and my modem shows signs of activity even though there is none, while my mouse still have the laser switched on. its only after i flick the power switch off on my psu that they stop responding.

Switching the psu back on cause those two components to start up again.

I have no idea what the cause is, as iv used the psu before on another system and it worked fine.


This is not exactly a big problem as it doesnt do anything, its just a little hassle that id rather not have if i can avoid it.


sooooo, anyone got any ideas????


btw i have a motorola SURFboard SB4200 External Cable Modem and a logitech MX510 mouse

well, they both have USB capabilities, but I use the ps2 port for the mouse and the ethernet for the modem. oh well, just wanted to check that it wasnt damaged or whatever.

But i see what you mean about charging up stuff. makes sense

@dahak: yeah i always unplug the mains aswell just to be safe

Because you can power on most computer with the keyboard or a mouse click, power has to be present to these devices.

You can check your BIOS to see how to activate these feature.

The external modem has its own power supply. If you look carefully, you will find a power cord attached to the back of it. The power cord will most likely terminate in one of those little blocks that are such a pain to deal with. You should also find a discrete on/off switch on the back of the modem.

PS/2 ports are powered. That is why the mouse remains active. You will also observe that the ethernet port on the back of your system remains lit even when the system is turned off. All of this happens because some residual power is supplied to the MoBo to enable certain peripherals to "wake-up" the computer on reciept of input by these peripheral devices. Wake on keyboard / mouse; wake on LAN; and, if you have a fax/modem card installed in your computer, wake on ring.

Your system is working correctly. There is no need to worry. If you check your MoBo manual, it may reference one or more LEDs that indicate 5 V power flow to the board.