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Motherboard does not shut off

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by metallica 1 view

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I recently bought a new computer with a Tyan trinity s2390 motherboard.I have 256 mb of ram I am dual booting with Win98 and Win2000.Everything works great exept when i shutdown the computer the optical mouse and keyboard syay powered up.I have contacted tyan and they say this is normal on newer motherboard,They say it keeps the +5v powered all of the time.Has anyone ever heard of this and why would they make this an option of the motherboard.Also if anyone knows of a work around to shut these devices off when the computer is shut off i would lovew your advice

6 replies

by zlitocook

I have not seen this yet but it sounds alot like the older ATX mainboards that had problems with the same thing two years ago. I had to go to power manager in device manager and disable it. And it to the BIOS and disable it from there too. The powerto the computer lets the mainboard power up from sleep mode faster some mainboard makers use this to skip a few step in making the board but makes it harder on the user.

by acosgrove

I know that when the newer motherboards are powered off that there is a small amount of current still flowing through them. This is necessary for the new "soft" power switches to work. However this certainly shouldn't be enough power to keep the mouse and keyboard powered up. The only thing I can think of is many new Bios' have an option that will enable the keyboard to power the computer back on. (Some keyboards have a key labeled "Power") If this is what's happening, there should be an option to turn this off. Unfortunately I'm not sure exactly where in the BIOS this would be. Probably under power managment. I hope this helps.

Good luck

by acosgrove

Another thought is that if the keyboard and mouse are USB and plugged into a USB hub then you may want to see if it's a Self Powered USB HUB meaning that it has a power adaptor plugged into it. If this is the case then the devices are probably drawing their power from the HUB. I've seen this with Keyboard Wedge Adaptors for bar code scanners. Many times if these devices are self powered, the keyboard and scanner will still have power even if the system is off.

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