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Black screen; Computer still turns on


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#1 masterkaga

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Posted 04 September 2010 - 01:49 PM

Hello,

I am having a problem with my computer starting up but no image is displayed on my monitor. Is this a black screen of death?

I have an MSI K9MM-V mobo
1GB of DDRII Memory
BFG NVIDIA GeForce 7300 video card
running Windows XP SP3

Yesterday all my troubles seemed so far away. I opened my computer to check my memory. I wanted to buy more so I wanted to see what brand I had. I unpugged my computer took the memory card out, checked it, then put it back in. I plugged the computer back in and pressed the power button and it turned on and shut off immediately. I also smelled something burn.

I waited a bit, pulled the memory out again and reinserted it. I turned the comp back on and it powers up seems to work but there is no activity on screen, just completely black.

I thought maybe my video card burned out or got jostled out of place, so I turned everything off and uninstalled it and reinstalled it. Still no picture.

Maybe it died, so I unplugged it again and connected my monitor to the onboard graphics port. No change.

I cleared the onboard memory to the motherboard by shorting the memory pins to see if I had to "wake up" the onboard memory. Nothing.

So I have come here. Computer turns on, lights up, fans start spinning, hard drive sounds like it boots, disc drive spins and opens and closes... but there is no picture. (oh, I forgot. I have also checked the monitor against another computer and it works fine.)

Does anyone know what I did to it?
Thanks.

Edited by masterkaga, 04 September 2010 - 01:52 PM.


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#2 MrBruce1959

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Posted 04 September 2010 - 02:06 PM

Hello and welcome to Bleepingcomputer.

You may have shorted the motherboard out to the computer case somewhere when you removed and re-installed the memory stick.

I suggest you check this possibility out.

If you smelled a burning smell, chances are, there is some physical signs of burn damage somewhere inside the computer case.

A close inspection of the motherboard may reveal this possibility.

Bruce.
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#3 masterkaga

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Posted 04 September 2010 - 02:09 PM

I'll go check. You mean a shorted motherboard can still work to some degree? Because it still seems to work; turn on the Hard Drive and such.

#4 masterkaga

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Posted 04 September 2010 - 03:35 PM

hmmm, can't seem to find any visible damage.

#5 MrBruce1959

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Posted 04 September 2010 - 05:34 PM

We have here no video on both intergrated and add-on cards, it is not common for both to burn out at the same time.

I have to ask if you checked the power connectors from the PSU to the motherboard.

There may be a faulty connection here, check those carefully.

Also you have to recheck all the outputs from the PSU to all hardware, you need to determine if one of your rails is fried.

This procedure below will help you test your PSU using safe procedures.

WARNING: THIS POST MAY CONTAIN DIRECTIONS THAT INCLUDE WORKING WITH LIVE VOLTAGES OR PARTS INSIDE A COMPUTER'S POWER SUPPLY THAT CAN CAUSE SERIOUS ELECTRICAL SHOCK OR SERIOUS BURNS, A POWER SUPPLY CONTAINS VARY LARGE ELECTROLYTIC CAPACITORS THAT ACT JUST LIKE A BATTERY OR VOLTAGE STORAGE DEVICE, THOSE AND OTHER ELECTRONICS FOUND INSIDE A POWER SUPPLY CAN STORE DANGEROUS AMOUNTS OF ELECTRICITY HOURS OR EVEN WEEKS AFTER ALL ELECTRICAL CURRENT HAS BEEN DISCONNECTED FROM THEM! PLEASE USE EXTREME CAUTION AND COMMON SENSE WHEN WORKING WITH POWER SUPPLIES OR AC VOLTAGES!


The purpose of this procedure is to bypass the motherboard to test a ATX PSU. Some manufacturers Like Dell have used some non ATX PSUs which have a different pinout for the 20/4 pin connector, please confirm that your PSU is a ATX type before using this procedure.

Caution:
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
www.playtool.com

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.

Also, this web site may help you.

http://www.playtool.com/pages/psucompat/compat.html

Bruce.
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