Question Motherboard wont turn on at all

[fred0002]

Before I begin explaining the issue this is my setup:

CPU: Intel i7-4790K
COOLING: Corsair H50 Watercooling
PSU: Corsair TX750W
RAM: HyperX 8GB ram 1866mhz
MOTHERBOARD: Z97-Pro

This is not a new pc, so it worked in the past, anyways the main issue is I cannot turn on the motherboard even tho the power button flashes red (indicating power is connected), if I let the computer stay untouched for sometime it might boot and then turn off (I noticed this issue started happening after I changed the RAM).

Before REPLYING READ THIS:
I know that my CPU is not the problem I tested it on another motherboard
I know that the power supply is not the problem (I tested with other pc and power supply tester, all good)
I know it is not the RAM (I tried like 6-8 different sticks)
I know it is not the cooling, because of two reasons - 1. I tried other cooler, 2. It doesn't even turn on 90% of the times
I already tried changing the CMOS battery and using JUMPER to clear CMOS.


Please help I tried everything!! Rage, praying and crying. Please don't tell me I have to buy a new motherboard 🙁

 

[alexoiu]

By not turning on, you mean no fans spinning? Have you tried replacing the CMOS battery with a new one?
If leaving only CPU and CPU cooler installed, and starting the board, does the CPU fan spin?

 

[fred0002]

It is kinda weird - hear me out. Let's say I let the computer stay untouched for an hour and then I turn it on, everything works, but then it suddenly it turns off - after it turns off and turn itself on again it shuts down even faster and eventually it doesn't do anything. I hope my explaination makes sense. To answer your question, no in the end nothing spins not even psu.

 

[alexoiu]

Even though you tested the power supply in different pc, I suggest testing different one in yours.

 

[fred0002]

Even though you tested the power supply in different pc, I suggest testing different one in yours.

Okay Im gonna try that and I will post back in 15-20 mins

 

[alexoiu]

No problem. If starting, leave it to run, to see if shutting down.

 

[fred0002]

No problem. If starting, leave it to run, to see if shutting down.

Hey it is first possible for me to test a new PSU tomorrow, so we will have to wait. Out of curiosity why do you think it is the PSU (when I tested on another PC and also with a power supply tester that said it was fine)?

 

[alexoiu]

It's power related, so I'd say that the first to suspect are power supply, or motherboard. Since spare psu available, let's rule out a power supply related issue.

 

[fred0002]

It's power related, so I'd say that the first to suspect are power supply, or motherboard. Since spare psu available, let's rule out a power supply related issue.

Alright I had more succes with a new power supply. I get following error code 6A and then it goes to 00 or can only boot into BIOS.


#Edit

I managed to get it to boot into Windows, but then it randomly shuts down sometimes and restarts with error code 00

#Edit

I think it is a hard disk problem I have a SDD 500g and HDD 1tb - I use the SSD for windows system, but I cannot boot windows without the HDD for some reason.
If I discconect the harddisks it has np staying in the BIOS.

 

[alexoiu]

Does it boot from an USB drive? If yes, try reinstalling Windows, this time only SSD connected.

 

[fred0002]

Does it boot from an USB drive? If yes, try reinstalling Windows, this time only SSD connected.

Hello that was exactly my idea and I specifically have done that and the result is that: so far everything works now! So I will be ordering a new PSU. To sum up the issues were the following: Bad PSU + Faulty Hard drive, not SSD but HDD


Before you leave this thread I have a couple of questions:
1. (Notice: Different issue, cuz I tested without monitor anyway) I noticed that my DisplayPort cable shorted the computer it kept trying rebooting. Is that even possible? I changed the cable everything worked fine.
2. Could you keep watching this thread, new PSU arrives tomorrow and i will test everything again + graphic card, if I have any further issues, please stay posted, that would be appreicated!

 

[alexoiu]

1. Not sure about the DP cable. It can cause a short, if defective and 3.3V present.
2. Sure, just post back.

 

[fred0002]

1. Not sure about the DP cable. It can cause a short, if defective and 3.3V present.
2. Sure, just post back.

Okay I installed graphic card and new PSU, now the PC shutsdown after 5 seconds. If I remove the RAM it can power on just fine? Not sure whats going on.

#Edit
I tried removing the graphic card, no difference.

The new PSU is Corsair HX1000

 

[alexoiu]

Make sure that you're inserting the RAM all the way in. Test with single RAM each slot on board.

 

[fred0002]

I did it is not working :/

 

[alexoiu]

Try taking the board outside the case, removing all components/cables, including the CPU, and starting from zero, board outside the case.

 

[fred0002]

I did that now the motherboard wont turn on, but there is still red light. I think I give up now 😛 You have more suggestions?

 

[alexoiu]

Can you post a picture of the board? Check also https://forums.tomshardware.com/thr...ng-about-post-boot-no-video-problems.1285536/
See if you missed something...

 

[fred0002]

I can post a picture, but you seem hopeful, why?