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Possible mobo problem ?

Last response: in Motherboards
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March 1, 2011 5:43:53 AM

Hello,
newbie here. info on issue. pc was running slow and would not shutdown properly. ran a virus scanner. repaired/removed infected files (22 files). rebooted pc. pc would continuously reboot. ran a repair with windows xp os cd. now pc would continuously loop and keyboard will not respond. side note, i tried 2 different keyboards, both of them would light up briefly upon boot up. i would like my keyboard to respond so that i can get to the bios or even try a reinstall of the os. any assistance would be greatly appreciated !
ecs nforce3a board

More about : mobo problem

March 1, 2011 9:40:36 AM

Could be a motherboard issue.

If you're not even getting into a bios screen you're pretty F'ed.

Have you tried without anything plugged in accept the monitor and power?
Have you tried taking the RAM out and just having one stick in?
What exactly happens? Do you not see anything on screen or do you see BIOS but can't use your keyboard to sign into BIOS?
Is your keyboard USB or PS2?
If it's USB, can you use a PS2 keyboard and vice versa?

Aside from all that, keyboard issues can often be a motherboard failure.
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a c 156 V Motherboard
March 1, 2011 10:30:54 AM

The first step should be making certain the hardware works.

Work systematically through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card.

Silence, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.

The next step should be a clean OS install, preferably on a different hard drive.
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March 1, 2011 11:46:34 AM

This is why jsc is an Expert ^^^^^ :D 
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March 1, 2011 4:14:55 PM

acer0169 said:
This is why jsc is an Expert ^^^^^ :D 


hello,
thanks acer0169 and jsc.
i will try that later tonight and keep you posted.
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March 2, 2011 4:43:31 AM


just to give additional info.
the pc was running for about 6yrs prior to this.
anyways, i disconnected the hard drive, video card and memory.
only thing that was left is the board, cpu and heatsink.
psu and speaker is connected.
i pushed the power button and nothing.
no fans turned on, nothing.
i checked the board, the light on the ethernet port lights up.
any suggestions ?
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March 2, 2011 6:03:36 AM

i put back the memory, hard drive and video card.
tried to turn it back on and same thing, nothing.
ethernet port lights up though.
will go to frys tomorrow and pick up a psu.
also i check the power switch wires to the board, its secure.
let me know if there is anything else i could try.
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a c 156 V Motherboard
March 2, 2011 2:49:35 PM

The ethernet port LED's light because the port gets its power from the small, always on standby power supply, not the main 5 volt bus.
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March 8, 2011 3:53:53 AM

ok, here's the situation now. i got a psu. i put it on and now the pc turns on when i turn on the switch from the psu (on the back of the case), i tried turning off the pc using the front power button and nothing. also nothing comes up on the monitor and no beeps. any suggestions ?
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