Weird 4790 problem - undetermined

[noodle with crab]

Here's the case:

I bought an i7-4790 a few months ago. At first, it works pretty fine and then, when I tried to plug in 4 memories for a 32G memory, the system rebooted at very beginning - no video output or anything, just about 5 seconds after pressed the power button, it reboot again and again. The motherboard I currently using will make some short beeps continously when I try to plug in 3 or 4 memories.

I tried to change motherboards (I returned and changed like 3 motherboards, because at first I thought it was some sort of motherboard problem), change memories (so I have 4 more extra memories right now), unplug video cards and hard drives - non of them are working. I guess it might be the problem with the memory controller, but I read another passage saying that it could also be a PSU problem. I have no idea what's going wrong with the system so I'm looking for some help.

 

Here's my system setup:

CPU: i7-4790 (without K) SR1QF

Memory: Kingston HyperX 8G DDR3 1866 *4 (can't plug 4 of them but any 2 of them works fine)

Motherboard: Gigabyte GA-Z97X-SLI

Power Supply Unit: EVGA NEX750G

Hard drive: 2x WD Blue 1T

Video card: 2x MSI 970 Gaming 4G

Other: 1x USB3.0 PCI-E card

 

[Guest]

18 minutes ago, noodle with crab said:

EVGA NEX750G

I think i found the problem.

[HPWebcamAble]

6 minutes ago, josephaltareb said:

I think i found the problem.

I'd suspect the MOBO and RAM first, but since the PSU is the only constant here, it must be the issue.

 

Try a different PSU OP, at least 700 W is a good idea

[noodle with crab]

50 minutes ago, josephaltareb said:

I think i found the problem.

Um, is there any problem with that PSU? It supposed to be a 750-watt psu and when I unplugged the video cards it still can't be booted.

[Guest]

38 minutes ago, noodle with crab said:

Um, is there any problem with that PSU? It supposed to be a 750-watt psu and when I unplugged the video cards it still can't be booted.

The psu has crap caps in them, so when the system is in load - no matter how much wattage - It will hang the cpu. Get another psu. prefer any one except for a NEX or a CX/ CXM

 

If it does not work then try replacing the ram, or in some situations the cpu.

[noodle with crab]

1 minute ago, josephaltareb said:

The psu has crap caps in them, so when the system is in load - no matter how much wattage - It will hang the cpu. Get another psu. prefer any one except for a NEX or a CX/ CXM

 

If it does not work then try replacing the ram, or in some situations the cpu.

Got it. I'll try to get a new PSU. Thanks.