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New build, won't boot

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#1 Pendulum


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Posted 19 November 2008 - 04:53 PM

My stepmom ordered a bunch of stuff against my recomendations, including a refurb BioStar motherboard. She also ordered an Athlon 64 AM2 Retail CPU/Heatsink, and 512MB Patriot RAM. The motherboard is the K8M800.

When I hook everything up, it wont boot. I get a short whirr of the fan and that's it. If I unplug the 4 Pin ATX12V+ (black/yellow), I get the system to run but nothing on the monitor. The LED on the monitor doesn't even go green, just stays orange.

If I remove the CPU, I get the same results. If I leave the CPU out and plug the ATX12V+ in, I get it to run but still no monitor output.

It's an Antec 350W PSU. 20 pin PSU, 20 pin motherboard.

I suspect the refurb'd motherboard is the problem.

Anyone have any other suggestions?

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#2 hamluis



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Posted 19 November 2008 - 04:56 PM

Do you have access to another system?


#3 Pendulum

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Posted 19 November 2008 - 04:59 PM

I'm using her laptop to post this. My ex stole my computer, so I don't have access to another AM2 system. Just an old Socket A system.

#4 garmanma


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Posted 19 November 2008 - 05:09 PM

If I leave the CPU out and plug the ATX12V+ in, I get it to run but still no monitor output.

If the power supply checks out, I would suspect the CPU
Your best bet is to take it out of the case and run it on the bench with just the minimum attached. Adding things back one at a time

Caution: There are electronics inside the case that are very susceptible to electrostatic discharges. To protect your computer, touch the metal of the case to discharge yourself of any electrostatic charges your body may have stored before touching any of the components inside. As a safety precaution you should unplug the computer to avoid electrical shock.
The purpose of this procedure is to bypass the motherboard to test the PSU.

This procedure will involve working with live 12VDC electrical potentials which if handled improperly may lead to electrical shock. Proper precautions should also be taken to prevent electrostatic discharges (ESDs) within the case of the computer. For safety purposes please follow the instructions step by step.

First, shutdown your computer. Then unplug the power cable going into your computer.

Once you have opened the case, touch the metal of the case to discharge any static electricity.

The connector of the PSU which connects to the motherboard is readily recognizable by the number of wires in the bundle. To disconnect it you will need to press on the plastic clip to disengage it and then pull the connector up and away from the motherboard. Please take notice of the location of the locking tab and the notch on the socket of the motherboard, this will only connect one way as it is keyed. This wire bundle will have a memory of the way it has been installed and will want to bend back that direction, you may have to play around with it to find a position that the connector will stay in the same position while you run the test.

Posted Image

From the top left to right the pins are 13-24, the bottom from left to right are 1-12.

Please notice that there are PSUs with 24 pin and 20 pin connectors, the location of the green wire in the 24 pin connector is #16, and the green wire in the 20 pin connector is #14. If you look at the connector with socket side facing you and the clip on the top the number one pin will be on the bottom left corner. This makes the pin out for the 24 pin connector from left to right 13-24 on top, and 1-12 on the bottom. The pin out for the 20 pin connector from left to right is 11-20 on top , and 1-10 on the bottom. If you look at the connectors you notice that these are sockets that fit over the pins on the motherboard where the PSU cable attaches, this is where you will place the jumper. For a jumper you will need a piece of solid wire about the size of a paper clip (20-22 awg), preferably a wire with insulation. It will need to be large enough to fit firmly into the socket so that it will not need to be held in place while testing. You are at risk of electrical shock if you are holding the jumper when you power up the PSU. Insert one end of the jumper into the socket of the Green wire, and insert the other end into the socket of any Black wire.

Once the jumper is in place plug the cord back in. If the PSU is working properly the case fans, optical drives, hdds, and LEDs should power up and remain on. I would suggest that you not leave this connected any longer than is necessary for safety purposes.

To reconnect the 20/4 pin connector unplug the power cord, remove the jumper, and reconnect the connector. Take a moment at this time to make sure that nothing has been dislodged inside the case.
At this point you can use a DC Voltage meter to read the different rail Voltages. You will want to insert the black probe into any of the Black (-) sockets, and insert the Red (+) probe in the five different colored sockets, one at a time. Below are the five different colors and their corresponding rail Voltages. The Voltages should be within about ten percent of the given values.

Yellow +12VDC

Blue -12VDC

Red +5VDC

White -5VDC

Orange +3.3VDC
Posted Image
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#5 Pendulum

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Posted 19 November 2008 - 05:12 PM

Should have mentioned that I already checked the PSU. It checks out fine. After checking the PSU, I removed everything but the CPU from the mobo. Adding things back one at a time, I got as far as the 4 Pin ATX 12V+. Once that's in, it won't even turn on. With CPU. RAM, both IDE'S and a floppy, I get the CPU, and PSU fans to run, onboard NIC to light up, but nothing displays on the monitor. If I remove the CPU, leaving RAM, IDE, floppy, it runs. Still no display. Adding the 4 pin ATX, it runs, still no display.

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