CPU Broken from the Box - possible?

[Agnon]

Hey there.
So a couple of days ago i wanted to upgrade my system with an Intel I9  9900KF and a new motherboard because my current one didnt have the needed 1151 socket.

I assembled everything with some of my currently used parts like my GPU, HDD, RAM and so on, but couldnt even post to the BIOS. On this motherboard there was an 
LED claiming that the CPU was the issue - not being supported or broken as the manual described. 
I had the feeling that my motherboard - although generally supporting i9 - didnt have the BIOS to actually do so, as some reviewers on the product's site claimed happening to them. But with no other fitting CPU to check if it actually was the motherboard not being able to handle i9 due to the missing BIOS or the CPU, I decided to return the Motherboard. 

Now i got a new Motherboard - ROG STRIX Z 390-F Gaming - and when trying to post I also have this new motherboard display an issue with the CPU via lit up LED on it. 

So now im wondering if a new CPU can be faulty out of the box although being brand new? Or could i have made a mistake which i cannot see as of now?

What i did so far to troubleshoot/ What i payed attention to while building:
- I've checked my CPU multiple times for any kind of visible physical damage ( of which there isnt any as far as i can tell - if needed i can obviously provide pictures) as well as the pins on both motherboards.
- I used gloves for the whole process of bulding my PC and still made not sure not to touch the CPU anywhere else other that the sides.

- I asssembled everything with the PCU unplugged.

- I made sure all necessary cables from the Power Supply, ect. are actually connected in the right way (twice - with both motherboards ) 

- I tested the CPU with a fan first and then twice on the different Boards without one

- I gently placed the CPU in its socket and didnt scrape it across in any fashion while being able to gently close the lid with no big pressure what so ever.

- When i mounted the fan, I did not use excessive amounts of force on the screws.

- I connected my monitors to the GPU's HDMI and Displayports - not to the motherboard ones.

 

The only real contact that could be relevant to potential CPU damage happened when i mounted the CPU fan because there was a little bit of movement on top of the CPU with thermalpaste in between when i tried to get the screws to allign.

Could that potentially cause a problem with the CPU to completely fail?

If there is any other info that you need me to provide, I'm happy to give it but I dont feel anything else is relevant at this point of not being able to reach the BIOS.

If there is no eye-opening revelation, I'll just send back the CPU after the weekend within my warranty period.

I'd be glad if you all could give me some insight.

 

Btw im no native speaker, sorry for weird mistakes.

[boey]

9 minutes ago, Agnon said:

The only real contact that could be relevant to potential CPU damage happened when i mounted the CPU fan because there was a little bit of movement on top of the CPU with thermalpaste in between when i tried to get the screws to allign.

Could that potentially cause a problem with the CPU to completely fail?

shouldn't be an issue, if the cpu is properly socketed the worst outcome would have been thermal paste slightly spilling out.

 

Maybe try to blow on the gold contacts on the cpu? could be dust preventing proper contact. i've had ram sticks work after blowing on the gold contacts before, worth a shot. if it doesn't work, it's much much more likely that the cpu's faulty, and you should probably return the cpu then

[Agnon]

 

1 minute ago, boey said:

shouldn't be an issue, if the cpu is properly socketed the worst outcome would have been thermal paste slightly spilling out.

Could that actually break a CPU unless the paste reaches the Pins of the motherboard or the CPU bottom side?

[boey]

6 minutes ago, Agnon said:

 

Could that actually break a CPU unless the paste reaches the Pins of the motherboard or the CPU bottom side?

if a cpu is socketed properly it's pretty hard to damage it, you'd need a lot of pressure to break the PCB for the pins/contacts to be damaged

 

pretty hard for the paste to reach the pins once the cpu's socketed too. I've always had to slide coolers around on a cpu to align holes, especially with hard to mount systems(ahem, corsair's AIOs).