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New computer just built, not turning on.

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March 7, 2011 1:07:56 AM

Okay so i just finished building my first build,
i7-2600k
p67a-ud3
corsair vengence
samsung f3
haf 922
gtx570
corsair hx850w

so i did all the cables and everything and tried to turn it on, but nothing happened except a small light came on and went off on the motherboard. I unplugged everything and tried the little psu test and the fan twiched, not sure if the psu is working or what but it twiched, and i feel like its working, not sure what the problem is. Gonna take it to microcenter tommorow or something and see what they say. But any suggestions other than that?

More about : computer built turning

March 7, 2011 1:37:55 AM

i have tried a majority of the things on the checklist, but im either missing something or im just dumb as nails. so i just figured taking it to microcenter would be the safest and best thing to do as they can see the system in full, and i wont mess up stuff.
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March 7, 2011 1:47:32 AM

If you think the power supply is to blame you could jump the power supply and plug in a fan (unless you have already done so, I'm not sure what you meant by power supply test you mentioned) to see if it works. I can help you out more if you need to know how to do that.
March 7, 2011 2:06:19 AM

thats what i did and the fan just twiched
March 7, 2011 2:09:05 AM

Was anything else still attached to the PSU?
March 7, 2011 2:10:36 AM

the case fan
March 7, 2011 1:58:54 PM

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.
March 8, 2011 3:36:23 AM

hah it was a dead powersupply, but now if i plug in my case fans my computer wont turn on, if i take them out it does. so im thinking the case is fucked up.
!