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Is my motherboard going bad?

My computer is 8 years old, but does what I need it to do. My hardware is a Gigabyte EP45-ID#P mb, Intel core 2 duo 8400, Corsair TX 650 power supply, and because I thought it was my graphics card, a new MSI Geforce 950. Memory is G Skill DDR2 1088 which test as good. When I power on my computer, I see the posting screen, and sometimes, get to the welcome to windows screen before the monitor goes blank for around 3 minutes. Then the monitor pops on, and off, a few times, then works perfectly. The monitor works if I use it for streaming TV, I tried a new cable to the monitor, I had the same problem with the old, and new graphics card. A software program tells me the voltages to the mb are good, and all the temps are excellent. I have a power supply tester on order. To rule out viruses, or software problems, I installed a new hard drive and did a clean install of Win 7. I know it is time for a new build, and I am saving up for that, but I would really like to identify the problem I have.

Update (03/28/2017)

I see nothing visible from the side accessible, but have not pulled it yet. I have a case with excellent cooling, and have never had heat problems I am really puzzled by the short "warm up" time, then everything works. It works until the monitor is put to sleep, then it begins again. I found a deal on a used mb, cpu, memory combo, and will switch it all out next week. That should confirm if it is the power supply, and give me an opportunity to look at the other side of the mb. It has been doing this for a couple of months with no apparent change. I know all things wear out, but not being able to pin point the problem is annoying. I am shocked at the price of an exact replacement mb. They have held their value quite well.

Answered! View the answer I have this problem too

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Try a 1060, i5-7500, on for size. That'll run just about anything at 60 fps 1440p.

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@dispenser4hire , I would try a different monitor also. I've encountered 10+ year old ViewSonics that had some funny behavior due to their ages.

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I checked my monitor using Roku streaming TV, and it seemed to work well, but I will see if I can locate another monitor to check how my computer acts with it.

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Wait one minute... Or should I say more! Are you using displayport, and is your monitor a BenQ?

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What's the RAM configuration? Tell us about your hard drives.

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I think that you problem is a interface malfunction between the monitor and PC. Displayport can have this problem, so HDMI can have it too. If you have one, use a DVI-D cable as the signal is partially analogue. If your monitor doesn't support it, you must use VGA. VGA is and old interface, so I don't recommend it for 1080p+ resolution.

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Thank you for your help. I was using s DVI-D to HDMI with the same problems. I couldn't find an old VGA cable, but tried my brothers computer which worked fine at his house. It had the same problems that I had with my monitor. I can't say if it is an interface malfunction, but it is definitely a problem with the monitor. Many thanks once again.

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Do you have a DVI to DVI? I or D.

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Have you checked the Motherboard for areas of overheating. There maybe a section where the soldering has failed.

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Ed Schuetzle will be eternally grateful.
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