cpu Troubleshooting a possibly dead cpu

[Vlad02]

Hey guys, I bought an i7-4790k a few days ago for $25 saying that it's defective because it gives no display. I brought it home and I quickly set up a breadboard in order to test it, with a z97 Asrock Pro 3. It doesn't have an led indicator or light but it has a classic speaker which is supposed to indicate a post code.

I put the cpu in the socket and... Nothing. What should I have expected? It powers on the fans, but it doesn't even post, and after 10 seconds, it reboots and stays powered on and heating up without posting (so it is at least receiving power). 

I have swapped the cpu with my i5 4460 and it posts right off

So I have decided to check out some mysterious black silicone marks around the IHS only to find out after prying it open (with my nail!) that it has been dellided by a previous owner... And what a shock, the cpu was covered in a whack ton of thermal paste, it was over the cpu die and the nearby transistors so when I saw that I quickly had a glimpse of hope that if I manage to clean up the mess maybe it would be ok... But nope. I tried updating the bios, resetting the cmos, leaving the battery out overnight, reapplying thermal paste but sadly, it still does not post. 

So, my question here is, does somebody know even the craziest idea ever to try and boot this mf? Because for $25, I might aswell try everything in order to revive it. 

I have attached photos of the cpu and visually, it looks very good but internally... Who knows? 

[Skiiwee29]

Doesnt look like its missing any capacitors that I can see in the bank on the left. My guess is he hit the die itself and damaged the actual silicon. There is a spot on the lower left side that looks like a potential area in the photo, but not sure if its an issue with the photo or an actual spot of damage. Also the top right corner of the die looks to be possibly chipped as well?

[Vlad02]

1 minute ago, Skiiwee29 said:

Doesnt look like its missing any capacitors that I can see in the bank on the left. My guess is he hit the die itself and damaged the actual silicon. There is a spot on the lower left side that looks like a potential area in the photo, but not sure if its an issue with the photo or an actual spot of damage. Also the top right corner of the die looks to be possibly chipped as well?

I'll make a detailed picture of the die itself in a few minutes

[Vlad02]

Just now, Vlad02 said:

I'll make a detailed picture of the die itself in a few minutes

[Curious Pineapple]

5 minutes ago, Vlad02 said:

Image

Piece of the die is missing at the top right. It's dead Jim.

[Skiiwee29]

7 minutes ago, Vlad02 said:

yep as suspected, looks like when he delided it, it hit the die. Definitely a hit in the upper right corner. Shes dead. 

[Haro]

1 minute ago, Curious Pineapple said:

Piece of the die is missing at the top right. It's dead Jim.

WAA GONNA SAY IT

You beat me to it NO!

[Vlad02]

Yeah that appears to be chipped, idk how I missed that, in person it looks waaay smaller... 

Well that vice method definetely gave unexperienced people confidence in delidding, which on the devil's canyon it wasn't that necessary... Well it's dead

[Skiiwee29]

Just now, Vlad02 said:

Yeah that appears to be chipped, idk how I missed that, in person it looks waaay smaller... 

Well that vice method definetely gave unexperienced people confidence in delidding, which on the devil's canyon it wasn't that necessary... Well it's dead

It actually was as the TIM was horrible and there was a delta between different cores sometimes in the 15c or greater range so a Delid was required to fix it. Likely thats what cause the Original owner to do it.