Red CPU error led on motherboard

Slam · 24 Sep 2017 at 10:41

I bought a 2nd hand i7-2600k sandybridge processor to replace my i5-2500k.
Swapped the CPU out but pc won't post. The cpu error led on the motherboard is on.

Is there any point wiping BIOS and trying other troubleshooting things or is the CPU dead on arrival?

gavinh87 · 24 Sep 2017 at 10:47

Sounds like the CPU is dead. Both of those should work on the same bios rev.

Slam · 24 Sep 2017 at 11:03

Have put my old faithful 2500k back in, after what seemed like long long delay the pc posted and took me to the bios. settings seemed as normal and so I exited and booted up. thankfully my PC seems to working fine again.

I will try and return the second hand cpu (fingers crossed it'll be refunded)

Glanza · 24 Sep 2017 at 11:14

Have you updated your bios then tried the chip again before you return it?

On Holiday · 24 Sep 2017 at 11:33

Glanza said:
Have you updated your bios then tried the chip again before you return it?

Try this.

CPU failures are extremely extremely rare.

gavinh87 · 24 Sep 2017 at 11:48

2500k/2600k should be supported on same bios rev. They came out at the same time.
£10 says this is a CPU failure

Slam · 24 Sep 2017 at 12:02

I am on latest bios, last update was 27 Nov 2012.

As gavinh87 says, the 2500k and 2600k should be supported on same bios rev anyway, certainly enough to post.

I should have know PCs by now, there's always something to go wrong

jigger · 24 Sep 2017 at 12:28

What motherboard is it?

Slam · 24 Sep 2017 at 12:31

jigger said:
What motherboard is it?

Asus P8 Z68-V Pro

jigger · 24 Sep 2017 at 12:34

Then you might not have support for the 2600K. Have a look on the Asus site.

gavinh87 · 24 Sep 2017 at 12:37

Jigger helpful as usual
Core i7-2600K (3.4G,L3:8M,iGPU,4C,rev.D2) Supported since bios 0221, he has bios 3603.
CPU is dead.

jigger · 24 Sep 2017 at 12:40

Look for yourself OP. Im not sure Gavin is a full shilling.

Slam · 24 Sep 2017 at 13:44

2600k supported since bios version 0221

CPU is dead then

gavinh87 · 24 Sep 2017 at 13:45

Hopefully you can send it back.

jigger · 24 Sep 2017 at 14:09

Slam said:
2600k supported since bios version 0221

CPU is dead then

Most likely although it could be a BIOS setting or possibly a bent pin/bad contact. Running 4 sticks of RAM with Sandybridge can also throw up some problems too.

Slam · 24 Sep 2017 at 15:07

thanks for the responses (need to get my post count up so I can access the members market)

r7slayer · 24 Sep 2017 at 15:08

jigger said:
Most likely although it could be a BIOS setting or possibly a bent pin/bad contact. Running 4 sticks of RAM with Sandybridge can also throw up some problems too.

dude if his motherboard supports 2500k and it ran that fine and all he did is swap out the 2500k for a 2600k then no settings should need changing in the bios. I doubt its a pin because once again if that was true what ever is a ground pin on the 2500k its the same for the 2600k. You don't need to update a bios for swapping an i3/i5/i7 of the same gen.

Personally when i have any sort of posting issues i always go bare bones till i get a post. Everything disconnected just cpu and see if i get the cpu code up where bios tries to boot past cpu check which is usually first. Then i stick one slot of ram in and try again and try all ram sticks cycling them all till i post if other steps didn't work. Even try other slots of the same channel. Then if i post after this i tend to just connect the boot drive till i post and it tries to load the OS. After this i just connect everything.

But to me it sounds like a dead cpu.

jigger · 24 Sep 2017 at 15:10

Have you overclocked the 2500? Most of them offer a lot of headroom.

Slam · 24 Sep 2017 at 15:14

jigger said:
Have you overclocked the 2500? Most of them offer a lot of headroom.

yes, ran a 4.2Ghz overclock for the first 5 ish years. now running at 4.5Ghz. Just used the auto overclock feature in the bios and put the bclk down to 100 and multiplier to 42, now 45

jigger · 24 Sep 2017 at 15:15

Is that all it will do?