PC does not boot up! No beeps but CPU fan spins

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Greyfalcon

Greyfalcon

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May 10, 2015
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Hi! My old pc was working fine but I was rarely using it. It was intel based. I recently purchased another motherboard, cpu and ram combo (amd based) and I wanted to test it. So i removed the old motherboard and put in the new one and connected the psu n hdd to it and found that it was working fine.

So I removed the new motherboard and put the old one back in. But now it wouldn't post. The cpu fan spins. The power led lights up normally for a second at the start but then gets very dim. I removed the RAM to see if I get any beeps but it did not beep.

Is the motherboard dead? And if yes then what might be the problem? I was grouned at all times while handling the motherboards and I didnt even tighten the mobo screws tightly as I heard it can bend the mobo.

Also I tried to run it on my old PSU and the same thing happens. So if the mobo is dead, how do I know its not because of the current PSU i was using? Would it be okay if I use the same PSU for the new motherboard I bought? The psu is CM thunder 450w. I know its a terrible piece but I didnt know at the time of buying it. I dont hav any dedicated gpu so im sure I didnt stress out the psu beyond its limit.

Any help?
 
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Satan-IR
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Greyfalcon

Greyfalcon

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May 10, 2015
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Core 2 Quad Q9550
4 gigs of ddr2 ram
Gigabyte GA G31M ES2L mobo
WD Blue 1tb hdd
Cooler Master Thunder 450W psu

Yes I have plugged the cpu power cable in the motherboard!

Btw whats up with the website? :??: I dont see a reply option on my cellphone when I am logged in. I see the red icon for replying once I log out. So replying from my laptop now...
 
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Satan-IR

Satan-IR

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Apr 18, 2014
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That's some what old and the motherboard just might have died. You removed the RAM and no beep (assuming the speaker/buzzer on motherboard is a working one) that adds to the probability of a dead motherboard. Have you tried RAM sticks one by one if you have more than one?

When it doesn't work with another PSU as well it makes a dead PSU less likely. Although that's CM is not the best PSU at that capacity (450W) and it has like all other units have lost some of its nominal output capacity during the years.

As for this being caused by the PSU it can be. You can make sure if you or someone with the know-how examines that PSU with a multimeter to see if it's providing proper 3.3, 5 and 12 voltage.

You can also download or HWiNFO, portable version (no installation needed) run it and click the Sensors tab and see what voltages it shows.

You can find it here:

https://www.hwinfo.com/download.php

 
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Greyfalcon

Greyfalcon

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May 10, 2015
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I did try the ram sticks one by one and also tried putting it in each slot separately. The psu is no that old though. I got it in early 2016 and haven't used it much. I must have turned it on after months. I'll see if I can check the voltages tomorrow. Its night time here and looking for people with multimeter isn't possible. Thnks for the hwinfo link. But wont I have to connect the psu on a working mobo first to check it that way? Do i run a risk of damaging the other board if I do that?

Also if you rule out the psu as a cause, what else could kill a working mobo just like that? Did it happen because I removed it?
 
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Satan-IR

Satan-IR

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I did not rule out the PSU entirely and said it could be the cause of some component failure such as motherboards.

That's why I said you can test it and is partially tells you whether it's working and providing proper clean voltage on respective rails.

Components get old and they die. That motherboard is old, although I don't know how long you have used it. The PSU you said is not that old but that motherboard must have done a fair share or working I guess. Even brand new motherboard die after a little work and sometimes they are DOA. It happens.

Did it happen because you removed it no not really. Unless you discharged static into the board SMD/electronics which can damage them but you said you were grounded so that should have no happened.

Not really safe to test PSU voltages while it's connected to a motherboard and it's powered on. I mean you can do it. Experienced people do that but you might just touch something and cause short circuits, if the boards in not dead that might just do it! You have to power it on by shorting the green wire/pin with any black wire/pin (ground) out of the case and disconnected from the motherboard and other peripherals.

There's a video tutorial here:

https://www.youtube.com/watch?v=ac7YMUcMjbw

I have to emphasize please DON'T attempt this yourself if you've not worked with multimeters before and are not really sure what to do. You can electrocute yourself or damage the PSU and or the multimeter.
 
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Greyfalcon

Greyfalcon

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May 10, 2015
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Actually I was talking about checking the voltages with HWiNFO. Wont I need to put the psu in a working system to check that? Will it not put the other system components at risk?
 
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Satan-IR

Satan-IR

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Yes to check them with a software/utility like HWiNFO or Speccy it needs to be in system with Windows as those are Windows-based software.

Yes if a PSU is faulty and dying and if it does not have proper over voltage, over current and over temperature protections in place and working if anything happens it could damage other components.

Even if nothing happens to the PSU but it has harsh fluctuations of voltage and current it can damage other components.
 
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Greyfalcon

Greyfalcon

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May 10, 2015
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Sorry for the late reply. Had to go out of station for a week. The PSU turned out to be fine. I took it to a technician and he checked it with a PSU tester and told me its working ok.
Thanks for all the help!:)

 
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