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New PC won\'t turn on without graphics card. Please HELP!

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March 4, 2011 3:44:29 AM

I'm having an issued with a new computer I'm building. Now at first I thought it was the motherboard, but I got a new one of a different make, and still no dice. The problem is that the computer will not turn on when my ATI HD 5670 is not installed in the PCI-E slot. When it's not installed the PC turns on for a fraction of a second, the CPU fan starts to spin, but the computer immediately shuts off. No beeps. But as I already said... For some reason when my graphics card is installed. The PC boots up just fine as far as I can tell (all the fans spin, and the computer stays on). I don't get any signal to my monitor with the graphics card installed though... The PC will however boot (once again no signal) if I unplug the power to the CPU (ATX 12v? 4pin)I don't know what to do. This computer is wasting a lot of money, and I just want to find a solution... Everything is compatible with everything, and everything thing is wired/seated correctly.

AMD Athlon II X2 250 Regor 3.0GHz Socket AM3 65W Dual-Core Desktop Processor ADX250OCGMBOX

G.SKILL 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Desktop Memory Model F2-6400CL5S-1GBNT

DYNAPOWER USA Titan C05.N63.M158 Black SGCC Steel ATX Slim Tower Computer Case 430W Power Supply


GIGABYTE GV-R567D3-1GI Radeon HD 5670 1GB 128-bit DDR3 PCI Express 2.1 x16 HDCP Ready Video Card

ASRock N68C-S UCC AM3/AM2+/AM2 NVIDIA GeForce 7025 / nForce 630a Micro ATX AMD Motherboard

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March 4, 2011 5:30:49 AM

genericname6667 said:
The PC will however boot (once again no signal) if I unplug the power to the CPU (ATX 12v?

No, it won't. You need the CPU power plug connected to the motherboard. No CPU power, no boot.

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 not, 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: 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.
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March 4, 2011 3:11:45 PM

genericname6667 said:
I'm having an issued with a new computer I'm building. Now at first I thought it was the motherboard, but I got a new one of a different make, and still no dice. The problem is that the computer will not turn on when my ATI HD 5670 is not installed in the PCI-E slot. When it's not installed the PC turns on for a fraction of a second, the CPU fan starts to spin, but the computer immediately shuts off. No beeps. But as I already said... For some reason when my graphics card is installed. The PC boots up just fine as far as I can tell (all the fans spin, and the computer stays on). I don't get any signal to my monitor with the graphics card installed though... The PC will however boot (once again no signal) if I unplug the power to the CPU (ATX 12v? 4pin)I don't know what to do. This computer is wasting a lot of money, and I just want to find a solution... Everything is compatible with everything, and everything thing is wired/seated correctly.

AMD Athlon II X2 250 Regor 3.0GHz Socket AM3 65W Dual-Core Desktop Processor ADX250OCGMBOX

G.SKILL 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Desktop Memory Model F2-6400CL5S-1GBNT

DYNAPOWER USA Titan C05.N63.M158 Black SGCC Steel ATX Slim Tower Computer Case 430W Power Supply


GIGABYTE GV-R567D3-1GI Radeon HD 5670 1GB 128-bit DDR3 PCI Express 2.1 x16 HDCP Ready Video Card

ASRock N68C-S UCC AM3/AM2+/AM2 NVIDIA GeForce 7025 / nForce 630a Micro ATX AMD Motherboard


Your motherboard has integrated graphics.

In the bios, you can select which adapter(integrated or discrete) you want the bios post messages to appear. I suspect the default is the integrated adapter.
Plug your monitor into the mobo adapter and you should see the bios post messages.
Change the target of the post messages to the discrete card , attach your monitor to the discrete card and boot again.
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