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PC powers up but no feed to monitor

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This problem has some commonalities with others, but I think it is different enough to make a separate post about.

My PC is a custom build which has been running fine for at least 2 years now, until suddenly one day I went to turn it on and the PC was starting up but the monitor did not show anything.

If I unplug the monitor cable, the monitor complains it isn't plugged in. I have tried other monitors and saw the same result. Monitor ruled out.
The problem only happens randomly - sometimes it all works fine, and sometimes I have this issue for up to several hours.
One time I got a BSOD claiming an IRQL error, and then at reboot a "CPU not recognised" error.
And only just today the monitor just suddenly stopped working, but the PC didn't do a thing or make any sounds.

I am guessing it is a hardware issue, but I don't know how consistent it is and don't know if I can do the proper hardware troubleshooting myself.
I have read that it could possibly be a fauly graphics card, or motherboard. I ran a memtest86+ on my RAM for 7 passes and it was fine.

Any more tips??
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Hi UMBRA9 sorry to hear that you are having issues with you PC.
Can you please supply the following information if you are able to, brand and model of the MB, brand and output of the PSU and the brand and model of your video card.
I would like to check both your system temps and the output from the PSU and suggest initially using a Speedfan screenshot for this;

Download Speedfan and install it. Once it's installed, run the program and post here the information it shows. The information I want you to post is the stuff that is circled in the example picture I have attached.If you are running on a vista machine, please go to where you installed the program and run the program as administrator.

Posted Image

(this is a screenshot from a vista machine)

To capture and post a screenshot;
Click on the ALT key + PRT SCR key..its on the top row..right hand side..now click on start...all programs...accessories...paint....left click in the white area ...press CTRL + V...click on file...click on save...save it to your desktop...name it something related to the screen your capturing... BE SURE TO SAVE IT AS A .JPG ...otherwise it may be to big to upload...
then after typing in any response you have... click on browse...desktop...find the screenshot..select it and click on the upload button...then on the lower left...after it says upload successful...click on add reply like you normally would.

Screenshot instructions courtesy of happyrock :)
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