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dstreb
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Hardware issue after replacing processor

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HP Pavilion 500-281
Microsoft Windows 10 (64-bit)

I replaced my intel core i3 with a used i7, and it wouldn’t work. Screen was totally blank, although it sounded ok. So I put the i3 back in and it booted fine. I thought I’m gonna try that again and put the i7back in, and the same result - sounds like it’s booting but the screen is blank. No messages, nothing. So I put the core i3 processor back in, went to turn it on, and this time the fan starts to turn, then dies. Starts to run, then dies. No beeps, just a fan starting to turn, then shutting off repeatedly. And nothing on the screen.

 

I used a wrist wrist strap and was careful. What the heck is wrong?

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TheOldMan
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Here is the support page for that PC

https://support.hp.com/au-en/document/c04091805

 

The i7 has to match one of the choices on that list for it to work.

 

As far as the PC failing now, I suspect that either something got bumped and is dislodged or possible a bent pin on the CPU.

 

What is the model number or cat #of the i7 that was installed?


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dstreb
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The i7 is on the list - Core i7-4790S Haswell Quad-Core 3.2 GHz LGA 1150 65W

 

I must have bent a pin.  What are my options?

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TheOldMan
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Since the i7 was used, it might have been defective.  On thing to remember and it was not mentioned earlier - when changing the CPU and the heat sink compound.  It is critical to clean the CPU and mating heat sink surface and reapply the heat sink compound, before turning on the computer.  It could very easily destroy the CPU with doing that simple step.


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dstreb
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Unlikely, though, that both processors are dead. How does one check them?

 

And, presuming the receptacle  on the motherboard has some bent pins, do I have to replace the motherboard? 

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TheOldMan
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Assuming you read the caution about the heat compound aka thermal paste, and did not damage the CPU in that manner, it is unlikely that both would fail.  The only way I know to check them would be to try in another motherboard.

 

The socket is not changeable, so a different motherboard would be needed. 


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dstreb
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I have so much trouble finding the HP parts online page. Do you know which motherboard I’d need and the link for the HP parts ordering page? Thanks for all your help.

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TheOldMan
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Here is the support page for that motherboard

https://support.hp.com/au-en/document/c03885123

Verify that is what you have by comparing the picture and info on the picture vs the motherboard in the PC.

 

The HP part # should on a sticker on the motherboard similar to this

2018-08-26 15_30_32-Window.jpg


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dstreb
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Thanks for the picture of the sticker. It appears that HP doesn’t sell this motherboard. How does one purchase the identical board elsewhere? 

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TheOldMan
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I found a couple of places where that motherboard was available.  Several parts houses and, of course, EBay.  Google for the HP part # and they will popup as to where they are available.  EBay is usually a source where at least one can be found if all others fail to produce a board.


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