CPU not detected or fails - Red CPU Led Lit on Motherboard

[george1990]

Hi,

My motherboard is new & has no bend pins at all so that's fine, everything works inside the pc, gpu, fans, cooler, etc.

But i have no display on my monitor, also my keyboard and mouse don't lit up because a red cpu led is lit on my motherboard. every cable is perfect inserted inside.

The problem is sometimes i have display sometimes no.

Do i have a faulty CPU? i have it for about 2 years now.

SPECS:

MSI Z270 GAMING M3
GTX 1070
16GB DDR4
I7 6700 [NON K]
Corsair VS 550W

 

[scout_03]

name and model of the old board .

 

[george1990]

msi h110m-pro d

i had problem with that one too, so i guess is not the motherboard.

 

[scout_03]

you had the same issue with old board did you check your cpu and try to use only 1 ram module for boot .

 

[george1990]

Yes, i checked and re-arranged the cpu and heatsink. As for my memory, i only have 1x 16gb ddr4. To be more exact this is the memory i've got.

Kingston 16GB, DDR4, 2133MHz, CL15, 1.2V

 

[scout_03]

this one was a qvl list of board and you could do a memtest on it for error .

 

[george1990]

Sorry, could you be more specific please?

Also, i had my pc with my old board running for 2 years until last month and it worked perfectly then suddenly this happened. It gotta be the CPU maybe something is wrong with it..?

 

[scout_03]

all parts are old except board that is new so that why i ask you to memtest ram .

 

[george1990]

ram is allright, on my new mobo there is a dimm led which is lit meaning that is installed and fine, i was curios what means that led but in the mobo's manual says that is installed. Even if i were to do a test i can't i have no display, my pc works and everything works except monitor which i get no display, but it's because of the cpu led which is lit on my mobo, which means: not detected or fails

 

[scout_03]

if cpu led stay on system does not detect it also you have onboard video so remove gpu and plug monitor to board if you dont have any video cpu is defective .

 

[george1990]

I'll test it right now and let you know

 

[george1990]

Could you be so kind and tell me:

If i take up the GPU as you said and plug the monitor directorly to my motherboard via HDMI and i get display, what component is the problem and should be replaced?

Because i already know that if i don't get display even if i do what you mentioned then is a defective CPU as you said.

 

[scout_03]

if the onboard work then gpu need to be check but if there is no video even with onboard could be cpu and you have new board also did you check if that board use a 4 or 8 pins on the atx with the 24 pins and the cpu fan is well plug in if this all ok then cpu is to be look after ,

 

[george1990]

I took off gpu and now i have display with only my motherboard into monitor plugged, but i need to test it further, because i had display with gpu plugged too, and sometimes wasn't working, sometimes was working, it has 8 pins for CPU where you connect it to have power if that's what you mean, but motherboard definetly works, i need to see if cpu will fail again like this again and then i'll know for sure that it's cpu, i'll return with an update

 

[scout_03]

ok keep on for test your in the good way also if you couls stress test psu using occt .

 

[george1990]

Allright, now it's not working again even with my GPU out, red led from CPU is back on, i guess cpu is the problem.

 

[scout_03]

find a way to test cpu in another board to confirm is defect before getting any other parts .

 

[george1990]

It’s allright if even with a new i7 7700 won’t work i can return it for a refund, my guess for ‘sometimes having display, sometimes not’ is that the cpu is failing

 

[scout_03]

if it work with the i 7 7700 your ok but if issue still on would check board .

 

[george1990]

I’ll give updates, i should have the new cpu this tuesday, if it’s not gonna work then it’s weird, i mean mobo is new wihtout bend pins

 

[scout_03]

even new mobo could be defective .

 

[george1990]

If it is, it’s super weird then, i mean being defective exactly the same way as the last one was, it kinda makes you paranoic, what is more strange is, if the old one was indeed defective idk how it got to i build this pc 2 years ago and from that moment until last month it was never opened to re-assamble to components and so on

 

[george1990]

I forgot to post screenshots of the problem, i'll leave them here until i get the new i7 to test it.

You'll have to zoom in to see : https://imgur.com/a/1yBz4oA

 

[scout_03]

i would recheck if the 8 pins atx is fully inserted on the board that give power to cpu socket the other option would be to test with another psu .

 

[george1990]

That would be the second thing that i'm gonna do, testing the PSU, but first i'll change the CPU to see how it works, because on the old board was lit the cpu_led, on my new board is again lit the cpu_led, that means my old board still works, but the CPU is fried, i forgot to mention i got some power outs during the thunderstorms on my old motherboard with my current CPU so maybe that's why it;s acting like this. but nevertheless i'll try with another PSU if it's gonna be the same with the new CPU, still waiting to recieve it. I'll update if i'll manage to solve this