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Monitor not detecting input.

  • Graphics Cards
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Last response: in Graphics Cards
December 27, 2011 3:02:38 AM

So I'm building my first computer and I got everything plugged in and turned on. The fans start and the LED's on the motherboard light up, and the optical drive also works as well. However when I plug the desktop into my monitor it say it can not detect a signal, I tired VGA, HDMI, and DVI and I'm still getting nothing. I have pulled out and reinserted the RAM and the GPU as well as re-plugged most of the wires. So any ideas on what I should try to do next?

EDIT: Oh and my Specs are

CPU: i5-2500k
GPU: GTX 570
Motherboard: ASUS P8Z68 V-Pro
PSU: Corsair TX850M
RAM: Corsair Vengeance 2x4 GB (low profile)
Hard Drive: Samsung F3 1TB
SSD: Crucial M4 128 GB
Case: Cooler Master HAF 922

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a b U Graphics card
December 27, 2011 3:22:32 AM

What you have is the classic "New build will not boot " problem.

Odds are you neglected to plug something in.

Work systematically through our standard checklist and troubleshooting thread:
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 no luck, continue.

The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.

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.

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 (standby power supply): 5 volts always on. The green wire should also have 5 volts on it. It should go to 0 volts when you press the case power button (this is also a good way to test the power switch and the associated wiring), then back to 5 volts when you release the case power switch. 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.

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.

a b U Graphics card
December 27, 2011 3:29:20 AM

Do you have the monitor plugged into the motherboard instead of into the 570? It must be plugged into the video card to work.
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December 27, 2011 3:44:31 AM

kajabla said:
Do you have the monitor plugged into the motherboard instead of into the 570? It must be plugged into the video card to work.

Yeah, I have it plugged into the graphics card trying both just DVI and using the DVI VGA adapter. Anyway Ill, go through the checklist in the morning.
December 27, 2011 5:15:12 PM

So I'm rebuilding using POST beeps as a guide, and I'm either getting one long beep and two short beeps which the manual indicates a memory problem, and in different situations and I get no beeps at all.