PC turns on and off (can't turn it on with the power button also)

[hallowman_eduw]

Hi, I'm new to this forum but I'll try be as concise as possible.

 

I have purchased a new PC, and it has been working fine for some weeks now.

 

Today I saw that the PC started by itself and then shut down (within 6 seconds) and no display were shown. To my surprise it kept doing this until I turned the PSU switch to off.

 

I have researched through Google but with no luck. Here is what I have tried:

• Checking the PSU cables - They seem fine and the fans and LEDs work, but just for some seconds before it shuts down .
• Checking the CPU for broken pins or other issues - The CPU seems to be fine.
• Removed the GPU - Same outcome
• Removed some RAM slots and exchanging where they sit - No success also
• Checking the motherboard's cables to see if they are loose or not connected - No success

 

Also I have noted that there is a Yellow light in the motherboard, but this light I remember has been present since the beginning.

 

Here are the specs:

• Micro-ATX MSI B450M PRO-VDH Max
• AMD Ryzen 7 2700X Octa-Core, 3.70 GHz
• Sapphire Nitro+ Radeon RX Vega 64 8GB HDMI / DUAL DP (UEFI) Full
• G.SKILL Aegis 16GB (2x8GB) DDR4-3000MHz CL16 
• SSD M.2 2280 Western Digital Blue SN500 500GB 3D NAND NVMe

What can I do ? Do any of you guys have had this problem ? 

 

Please bare in mind I'm still a beginner (even though I can understand most things) and also I do not have any tools for disassembling the PC other than the common tools in the house hold (for example I do not have termal paste, special tools, etc.)

 

 

Thanks for any guidance,

[WambleCropped]

what kind of pc? Like prebuilt? If so check the front panel cables, if you moved it recently it might have been dislogded

[WambleCropped]

also, does anyother front panel things not work USB, 3.0 audio?

[hallowman_eduw]

33 minutes ago, LucidLegends said:

what kind of pc? Like prebuilt? If so check the front panel cables, if you moved it recently it might have been dislogded

Yes it was a prebuilt, so to check the front panel cables should I remove the panel ? 

[hallowman_eduw]

35 minutes ago, LucidLegends said:

also, does anyother front panel things not work USB, 3.0 audio?

The front panel seems to work since when the PC turns on the power button light does turn (if I try to turn it on manually nothing happens).

 

As for USB I can't really tell since the PC now only turns on when I disconnect and connect the power supply cable and then it does not stay on for long enough that I can see the mouse lights or keyboard lights turn on.

 

About an hour ago they were turning on and the lights of the keyboard and mouse were on. I disconnected them to try and see if they could be the culprit but it does not seem like it.

[WambleCropped]

are there any bent pins for the front panel wiring? coudl the power switch pins be broken/bent?

[hallowman_eduw]

41 minutes ago, LucidLegends said:

are there any bent pins for the front panel wiring? coudl the power switch pins be broken/bent?

No, I don't think so as just yesterday at night it was fine. When I woke up, after some time it started turning on and off all by itself. My biggest suspicion is the power supply, it is 620W and I don't know if it can sustain the system.

 

When I bought it I Over Clocked it but just by a fraction, and it has been weeks working fine while Overcloked. 

 

My biggest worry is if it is the CPU but it does not show any signs of damage and it is a brand new one.

 

Thanks for the help,