mouse and keyboard not working

[danielmoriarty]

Hi, Yesterday i upgraded my pc with a new motherboard, a 2.93ghz celron D and 1gb ram... it was working fine with a 400w psu. then after 10 minutes it turned it self off, and wouldnt come back on again... i swapped the psu for an old 350w one i had.. it worked again now my mouse and keyboard (both usb) dont work.. not even in the bios. i tested them on another pc and they both work fine, and have tried swapping them for PS/2 mouse and keyboard with the same effect.. I cant reinstall windows as i cant get the bios to boot the cd ahead of the hdd. any ideas what's causing the problem and any soloutions.

[bassman]

Hello danielmoriarty and welcome to http://pcguide.com/ubb/pcgubb.gif

Sounds like the possibilty of a shorted mobo :( Have you tried resetting the BIOS (pulling the battery for a minute)? Be sure to NEVER plug/unplug PS2 devices with power on. Is the CPU fan turning? Can you test the 400w PSU? Might be best to not do this in another machine.

[danielmoriarty]

the fans are turning, and loads windows... just none of the usb or ps/2 connections dont seem to be working.. how can i test the 400w psu with out plugging it into another pc? should also mention that when i turn the pc on, the lights on the keyboard light up.. and the optic on the mouse glows

[John0904]

how can i test the 400w psu with out plugging it into another pc?
http://www.newegg.com/Product/Product.asp?Item=N82E16899888901
I have one of these and testing the PSU couldn't be easier.

[bassman]

OK, so you can still get it to POST and load Windows. I'm curious how you get past POST without a functioning keyboard.
I am assuming the lights are on the USB keyboard and mouse. Is that correct? If so powerdown and unplug power cord. Unplug all USB devices. Pull battery off mobo for several minutes. Reinstall battery. Plug in PS2 mouse/keyboard. Power up comp. Test PS2 keyboard/mouse for functionality.

One more question. Are you using the USB ports directly below the PS2 ports for your mouse/keyboard? OK, two questions :rolleyes: Have you tried other USB ports?

[danielmoriarty]

i've tried using the usb ports below the PS2 ports, tried using ones at the front of the case.. none of them are working.. tried taking out the battery as well, now it doesnt even load windows. doesnt even load bios.. tried diffrent screens, tried each hard drive on its own... just get a black screen...

[bassman]

Ummm, did you put the battery back in? This is a very common technique to clear the BIOS of any changes. It returns it to original defaults. The battery is there to maintain any changes made.

[danielmoriarty]

put battery back in... think the whole pc is messed up, screen doesnt turn on anymore.. and the harddrives no longer seem to be functioning...

[Paleo Pete]

i swapped the psu for an old 350w one i had

If it's not working with that one, I'm not really surprised. It's an older unit and produces less wattage. I've also seen at least a dozen P4 machines that would not boot with less than 400W power supply, even nothing but motherboard video and keyboard.

I think the first thing to do is try a known good power supply and possibly as a bare bones rig, which means only motherboard, CPU/fan/heatsink, RAM, video and keyboard. I don't think it would be a short, since it apparently ran for at least a few minutes, a system with a short might spin the fans for a 20/th of a second...usually just long enough to blink the LEDs and spin the fans over. That doesn't rule a short or ground problem out entirely, but I think it is not very likely.

Also check the battery to be sure it was replaced correctly, putting it in backwards is easy and I don't think the computer will run. Usually the positive ( + ) side is up.

[danielmoriarty]

checked the battery, and done a bare bone rig.. the fans are working fine... but no connection is getting to the graphics/card monitor..., is it likely to be the graphics card which is not working now.. cause i was gonan buy a new one on tuesday anyway, so should i buy that b4 i send of the motheboard to see if that fixes it.. or just send back the motherboard before i carry on.

[korky45]

danielmoriarty You may find these links useful

http://www.pcpowercooling.com/support/ATX_troubleshoot.htm

http://www.ee.surrey.ac.uk/Workshop/advice/conns/connPSU.html

[ZuqR]

Anyone got it to work?
I´ve got the same problem.

(Sorry for my bad english, I´m from Sweden)