Question Cpu LED Light No Display Please Help

[NoahF98]

I’ve had a pc I had built years ago
Specs/Hardware: Motherboard-Msi Z170a Krait Gaming 3x, Ram-Corsair Vengeance LED 2x8gb 3200mhz, CPU- Intel i7 6700k, GPU-MSI Gtx 1080 8gb. I’ve had issues of certain games crashing or not running at all so I was recommended to switch the mobo because swapping the gpu didn’t work, I attempted to switch the mobo to the MSI mpg z390 gaming plus motherboard. When that was installed my pc would power on then turn itself off then on twice then stay powered on but no display, now switching the mobos back and forth both power on but have no display with the cpu debug led on. I have tried everything from other forums and videos, checked cables, reset the ram, checked the pins on each mobo and other things.. please help I put lots of money into this Pc

 

[Fix_that_Glitch]

Have you run a memory test on your ram one stick at a time? Have you tried using just one stick of ram at a time? Have you tried swapping out the psu for another one?

 

[NoahF98]

I have tried the one ram stick at a time, and unfortunately not able to test another psu, don’t have a spare and lack the money to just get another one so easily, psu had no issues before and is powering everything else just fine it’s 750w with no previous problems

 

[CosmicDance]

Hi Noah

Please try putting your RAM into slots A1 and A2.
This will go against your motherboard's instructions as they generally say for two sticks use either A1 & B1 or A2 & B2.

This suggestion for your mobo comes from the thread below as it is from a user with similar symptoms and same mobo as yourself who couldn't get it to boot.
Scroll down through the responses and you will find the poster called Dennis solved his PC not booting by changing to this RAM seating configuration.

MSI Z170A Krait Troubleshooting

Hey all, I'm putting together my first rig and I've bumped into a problem. I'm using the MSI Z170A Krait motherboard and currently I have 1 stick of 8GB DDR4 ram install, the i5-6600K CPU on it with cooler attached, along with my MSI R9 390 GPU. Upon shorting the power pins to start it up...

forums.tomshardware.com

Also read through the whole thread as a CPU cooler not properly working or seated may cause boot problems which is talked about by another poster.
Even if the CPU fan is spinning the BIOS sometimes doesn't detect it as 2 of the pins are for power and 3rd/4th for monitoring and controlling purposes.
On some mobo s this causes a boot failure to avoid frying the CPU.



If this doesn't help then try and google the CPU debug led codes for your mobo or look in the manual as these can really pinpoint specific problems.

Andy

 

[NoahF98]

I tried putting single ram into each slot or both in each slot nothing has changed also I have a liquid cooler the H11oi gtx to be exact and I know it’s seated correctly and is working well.. the manuals for the debug light don’t give any info to help the cause for each motherboard I have tried going back and forth and trying multiple things for each and no fix yet.. thinking I need to replace either the cpu or the psu but don’t know which to try first

 

[CosmicDance]

Ok I appreciate you no doubt will have spent hours trying various things and different configurations along with 2 different mobo.
It is frustrating sometimes when you can't identify the specific fault but it is narrowed down now to either the PSU, RAM or CPU.

Try to google or search on this forum for your CPU debug codes specific to your system.

I can offer my help from personal experience of building PC s over the years and having faults that I have sorted usually with the help of others from forums like this one.

You have tried 2 mobo so it can't be the CPU header not providing power.
If you have a spare cooler then fit and try that with the CPU to see if it boots.

If not then use a working case fan, preferably the one fitted inside your PC.
Plug the CPU cooler connector into the case fan header.
Plug the case fan into the CPU header.
This way the mobo will still detect fans and cool the CPU but if your CPU cooler is faulty it won't stop the PC booting as the mobo will detect a working fan connected to the CPU header which is actually your case fan.
If it boots this way then the CPU cooler is faulty.

Some mobo will refuse to boot if a CPU cooler is not detected or it is defective.
It might spin the fans still but it might not detect it if it is faulty as there are 4 wires.

A PSU failing mid-game usually causes a system reset or just shuts the PC down.
A system crash is different to this though so it depends how your system actually crashed before during certain games.

A CPU failing or failed already is usually definite i.e. works or doesn't but not intermittently.

RAM failing can cause crashes, BSOD, freezing amongst other things and tends to be intermittent & varies according to use e.g. gaming can cause it to crash or benchmarking software that pushes the PC's hardware.

I would try a replacement PSU as this is the cheapest option and often a common fault.
I know you said it's a 750 watt so plenty of potential power but this is only if it's working ok.

If you get a PSU from Ebuyer you can return it as unwanted under their RMA returns system even if you have opened and used it.
I have bought and returned a lot of components from them.

Not sure about a CPU from them under the same system as it would have been covered with thermal paste.
If the replacement PSU doesn't work then it's either CPU or RAM that's the issue.

Both sticks of RAM wouldn't likely fail together, maybe 1 on rare occasions.

If you have a CEX shop near you then take your RAM in and pretend you want to sell it.
They test it, like all PC components, rigidly before resale so will tell you if it works.
Once they have tested it, usually 20 minutes, just say you changed your mind as the price they offered is too low.
They don't actually pay until testing is complete so it's not a refund.

These might seem a bit like unorthodox approaches but as it's a case of eliminating possibilites as it avoids buying new parts which might not even be faulty.

A faulty or failing PSU can provide low power and illuminate the mobo and power USB ports but fail to boot as it is a huge power demand.

A dead CPU tends to give the symptoms you are experiencing.
The fact that it booted before the mobo change makes it harder to diagnose so I hope this helps.

Andy