Hi all. Firstly sorry about the briefness of my problem. I'm posting from my phone LOL. Basically, I put on my of on this morning and after a few mind, my of froze. I restarted via the button but nothing appears on my screen even though it sounds like everything is running. Only message I get is 'no input'. One thing I noticed is that my USB mouse and Ethernet light isn't working and no keyboard light. Any help would be brilliant. I will gladly put up my specs for the pc, once I cAn get to a computer. Thank you!
You have worked through our standard checklist and troubleshooting thread:
yes? I mean work through, not just read over it.
Breadboard - that will isolate any kind of case problem.
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:
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. Try to borrow a known good PSU. 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.
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.
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.
my power button's light works fine. My psu, graphics card and psu fans work. My mouse light on my mouse briefly comes on for 1 second before switching off. I tried rebooting my computer with one of each memory stick.
I had this computer for 3 years now, with only upgrading my psu in the first year and graphics card last year. Sorry jsc, im a novice so I don't understand some of your explaination. I did the check list thing, slot of which applies to people who build their computers, which I didn't. I do have a spare psu, which I will probably test later on however, it doesn't seem like the psu is the problem. Is there any other test I can run. I don't have any other computers to test my componunts. Thanks for the help guys.