Sign in with
Sign up | Sign in
Your question

Solid Led after power outage

Last response: in CPUs
Share
Anonymous
a b à CPUs
July 26, 2010 2:16:41 AM

Hello,
During a storm the other day my power went out. Now my pc has a solid led on the power button. Seems to have no power anywhere else not even the fan on the power supply. I have tryed other power suplies with the same result. please help

More about : solid led power outage

a b à CPUs
July 26, 2010 6:55:03 AM

Take out the mobo and try it with only the cpu on it on a table.
m
0
l
a c 172 à CPUs
July 26, 2010 2:03:05 PM

You have worked through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
yes? I mean work through, not just read over it.

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

The breadboarding thread has a paragraph about how to build and test a PC in stages.

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. You do have a case speaker installed, right? If not, you really, really need one. If your case or motherboard didn't come with a system speaker, you can buy one here:
http://www.cwc-group.com/casp.html

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.

At this point, you can sort of check the PSU. In your case, use the best one that you have. You can 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...

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 PSU works, try to install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card. Silence or long single beeps indicate a problem with the memory.

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.

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.
m
0
l
Anonymous
a b à CPUs
July 27, 2010 12:17:15 AM

Thank you for your help. I have tested the PSU using the jumper method Green to Black. It powers on fine (PSU). Whats a DMM? I have a voltage tester but im not sure its the right one to use. i need to buy a new fuse for it in order to test the colored wires.
m
0
l
!