PC won't boot after new CPU installation

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CDDogg

CDDogg

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Aug 20, 2015
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So, I just finished installing a brand new AMD FX-4350 CPU in my PC my motherboard is compatible. I've also reset the CMOS. The computer is refusing to boot. All the fans run, but I'm pretty sure I don't have a post speaker(I do hear beepish noises when it fires up but I think that's the sound of the HDDs spooling up.) . My GPU appears alive, and I even removed my most power consuming RAM modules and it still didn't boot. Thus is can't be a PSU problem. There is no signal on any of my monitors and the keyboard does not power on. I can't find my thermal paste so switching to the old CPU isn't an option right now. Any ideas?
 
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If the paste was still new enough it is possible to spread it to make a good thermal layer again, but certianly not recommended to reuse.

Keep a close eye on your temps.
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CDDogg

CDDogg

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I am using an ASrock 970m Pro3 motherboard and I built the PC in late 2015. I haven't upgraded the BIOS since. I also don't even remember needing to update the BIOS so I have no idea if I've done it in the past or if I really need to for this CPU.
 
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CDDogg

CDDogg

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Well Im pretty sure I didn't upgrade the BIOS. I didn't think I needed to for the new CPU because it was listed as compatible with the stock motherboard. It seems I need to but I don't have any extra thermal paste. Do you think I can make due with the paste already on it? I didn't clean any off. Also my power supply is a CX 430 according to the wattage calculators it's about 50 watts more than I need.
 
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boosted1g

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No, you have to apply new paste, you need a smooth even layer of paste between the CPU and heatsink or you will damage the CPU.
If the motherboard turns on when you press the power button then CPU is almost never the problem.

So that 430w CX PSU is the older generation with green colored strip/letters on it right? These are known to age poorly and have failing capacitors.
So if you upgraded due to failed component or your new setup uses more power (even 20-30w) then that could certainly be your problem.

What is your GPU?
 
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CDDogg

CDDogg

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I have a NVidia GT 740 1 GB GDDR5. The new CPU came with it's own cooler and stock applied paste. I meant I haven't removed the paste from the old CPU or cooler. I just tried downloading the newest BIOS onto a flash drive to update through insta flash but USB devices aren't booting so not only can I not use the flash drive but I can't even use the keyboard to press f2 during post.
 
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CDDogg

CDDogg

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Just found a forum post on another website from some guys who had identical problems with the AMD fx4350. They fixed it by installing an updated BIOS. Now if only I can find my thermal paste maybe I can try it with the old CPU.
 
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CDDogg

CDDogg

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I solved the issue by going on my laptop and downloading the instant flash boot file for my BIOS. Then I used the old CPU to update the BIOS using the flash. Then I installed the new CPU and it works perfectly. I didn't replace the paste, I have caked on a thick layer to the old CPU so I reused some of that to replace the stock paste on the new CPU
 
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CDDogg

CDDogg

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I will, and I'm going to get some new thermal paste anyways. The stock cooler they sent is a really tight fit. When I removed the new cpu to put the old one back in the CPU actually came out of it's socket with the cooler(thankfully there wasn't any damage)
 
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