Question No start after CPU change

[hillsprint]

I am upgrading from a i7 6700 to a i7 7700K. I bought a used CPU and installed it on my Gigabyte GA170 HD3P motherboard. Started up the PC. Power comes on, graphics card lights up and light on back of motherboard lights fans run. It runs for about 10 secs and then shuts off, with no display on the screen. I checked that the fan was seated perfectly, reseated the RAM and removed the M/B battery for a couple of mins, but no change. Put my original 6700 CPU back in and I get the same 10 sec run and no display on screen. Any help appreciated

 

[rgd1101]

did you update the bios?
https://www.gigabyte.com/Motherboard/GA-Z170-HD3P-rev-10/support#support-cpu

full system spec? include brand and model of the psu

 

[hillsprint]

Didn’t update BIOS, but as I mention even when I put my original 6700 back it it does the same thing.

PSU is EVGA 600 watts
GPU is EVGA Geforce GTX 1070
Ram is Kingston DDR 3 16 mb
m/board Gigabyte GA170 HD3P

 

[DSzymborski]

Sorry board is a GA170 HD3P

There's a reason the question was asked. You could have downloaded the wrong BIOS or updated it incorrectly -- a BIOS update is necessary to run a Kaby Lake CPU -- and bricked the motherboard.

Also, what is the exact PSU? You've just stated a brand and a wattage, not the model. The PSU -- which may be junk and inappropriate given what EVGA offers at precisely 600W -- is probably not the problem here, but it may be a significant problem that ought to be dealt with as well.

 

[geofelt]

If the original 6700 no longer works, you may have damaged a cpu socket pin during the installation process.
It is all too easy to do if you did not drop the chip in cleanly and had to move it to get it seated.

 

[hillsprint]

OK thanks will look at the socket

 

[hillsprint]

OK, socket was damaged, so obtained another m/b a Gigabyte Z370 HD3. So carefully put my original i7 6700 in mounted the board in the case, made all the connection. I turn it on and it comes on for a second and immediately shuts down. By disconnecting various peripherals it appears that the A1 power cable that plugs in just above the CPU is the culprit. When it is disconnected the PC runs for another 5sec before it shuts down. So I changed the power supply to a new 650 wattage now a Azersize Jans 650 W F-Power, this gives the same result. Given that the original PSU ran this set up before I assume it is not a lack of power. I also tried this with the i7 770k chip and the same result.

So could it be that both the processors were damaged when fitted to the damaged socket?

 

[DSzymborski]

OK, socket was damaged, so obtained another m/b a Gigabyte Z370 HD3. So carefully put my original i7 6700 in mounted the board in the case, made all the connection. I turn it on and it comes on for a second and immediately shuts down. By disconnecting various peripherals it appears that the A1 power cable that plugs in just above the CPU is the culprit. When it is disconnected the PC runs for another 5sec before it shuts down. So I changed the power supply to a new 650 wattage now a Azersize Jans 650 W F-Power, this gives the same result. Given that the original PSU ran this set up before I assume it is not a lack of power. I also tried this with the i7 770k chip and the same result.

So could it be that both the processors were damaged when fitted to the damaged socket?

No.

You can buy every Z370 motherboard on the market and you'll never get either your i7-6700 or i7-7700K to work on any of them for the simple reason that you cannot run Skylake or Kaby Lake processors on anything but 100 and 200 series motherboards. 300-series motherboards are completely incompatible.

Again, this is where doing homework is important. Just like you never, ever, ever update a BIOS unless you're using the exact correct BIOS, you never, ever, ever buy a motherboard without verifying CPU compatibility.

If you checked your motherboard's page (https://www.gigabyte.com/Motherboard/Z370-HD3-rev-10/support#support-cpu), you would have found only Coffee Lake and Coffee Lake processors, as these were the only ones that ever worked, currently work, or ever will work with this motherboard or any other 300-series motherboard.

 

[hillsprint]

Thank you