PC help required

[Templeton Peck]

Son has built his own PC but it turns off after 25 seconds then turns on again. This keeps repeating. Any of you techy types got any ideas?

 

[Tredman]

Do you see anything on the screen? The sequence of beeps at the start will usually tell you what is wrong too.

 

[playtheace]

could be defective ram, try taking one out and vice versa and see if that does owt.

 

[Boozad]

Same with the graphics card. But yeah how many beeps is the motherboard giving on boot up? Does it reach BIOS?

 

[Templeton Peck]

Nothing on screen at all and no beeps.

 

[Alan]

You say he built it himself... I assume he applied proper thermal paste to the CPU and cooler? The boot cycling sounds like a heat failsafe to me.

 

[Boozad]

Could be. If that’s good then check everything is seated properly. Most good coolers come with decent paste pre-applied these last days though.

 

[Tredman]

Nothing on screen at all and no beeps.

The motherboard should have come with a small speaker which does the beeps IIRC, did he connect it?

Assuming the cpu is seated correctly (worth checking) then you will always get beeps.

 

[Templeton Peck]

It has paste already.

I'm not sure everything is seated properly and I don't think a speaker is attached to the motherboard. I'll check today.

Thanks all.

 

[Pablowolf]

Has it got far enough to have an OS installed?

 

[Templeton Peck]

No.

He's just run it without the graphics card and the memory in every combination and no cigar. I've told him to start again from scratch.

 

[Tredman]

No.

He's just run it without the graphics card and the memory in every combination and no cigar. I've told him to start again from scratch.

This will help fault find:

https://sterlingit.com.au/computer-not-starting-computer-post-and-beep-codes-decoded/

 

[Pablowolf]

Other than giving everything a good clean, I've no idea.

 

[Boozad]

I’d build it outside of the case first off and see if you can get it working that way.

 

[The Bear]

Is he 100% sure the CPU is compatible with the Mobo?

 

[Templeton Peck]

An IT bod checked his stuff and it's all compatible. Might be a dodgy part. We get no beeps unfortunately.

Thanks again all.

 

[Templeton Peck]

He's reassembled it and now it stays on. No signal to the monitor though.

 

[The Bear]

Make sure the monitor cable is plugged into the graphics card rather than the motherboard.

I've made that mistake before.

 

[Tredman]

Or take out the graphics and see if you get a POST when connected to the internal graphics.