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Hello I am getting one beep at star up but no signal On monitor

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December 27, 2011 12:46:46 AM

Hello so my question is I bought a new CPU ram and motherboard I installed it and it worked fine installed drivers restated and put it back on it's feet and now I get one beep and no signal on monitor have tried bot video card and integrated video card and same thing

I3 processor , asus P8h67-m le, evga geforce 280gtx 4 gigs of ram and 700 watt psu

Thank you for time and help Dylan
a b B Homebuilt system
December 27, 2011 1:31:29 AM

It failed when you physically moved it? It is assembled wrong. One beep is normal.
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December 27, 2011 1:40:17 AM

Yes I had it on it's side and moved it onto it's feet and now it's getting no signal o tried reseating the ram CPU and gpu and still nothing
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December 27, 2011 2:02:34 AM

Should I take it completely apart and rebuild it
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a c 122 B Homebuilt system
a b C Monitor
December 27, 2011 7:24:52 AM

One short beep is normal. That means that the BIOS POST routines have checked everything they can and have found no problems. Unfortunately, when it comes to the video circuits, the POST routines can only check the PCIe interface. They cannot check inside the GPU's.

Any other beep pattern means that something is wrong.

It's possible, but I find it really hard to believe that both GPU's failed at the same time. Before I went any farther, I'd verify that the monitor and its cable still worked.

Is the system still POSTing successfully (single short beep)?

If yes, clear the BIOS and remove the GTX280. Connect the monitor to the motherboard. Now check the system both lying down and standing up.

What happens if you lay the system back on its side?

If no (other beep pattern or silence), you need to do some trouble shooting.

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 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.
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 (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.
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.



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a b B Homebuilt system
December 27, 2011 9:26:15 AM

Th3dr4g0n said:
Should I take it completely apart and rebuild it


That's what I would do.
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December 27, 2011 9:59:45 AM

Thank you guys so much redid install one piece at a time made sure all connections were good and it works
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December 27, 2011 5:03:27 PM

Im having the same problem i bought a radeon hd 4350 512mb graphic card changed the bios settings cleaned entire pc out removed n cleaned card and port and nothing

When i turn on the pc i hear one beep then it goes to the xp sign then blanks out then the monitor reads "monitor is working out of scan range change pc setting "

im stuck should i return the card because i wasnt having this problem before i installed he card
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