Motherboard and CPU Connections
If your PC is not stable, powers on then off again immediately.
First check that the power switch on the back of the PC is clicked fully to the ON position
Most power instability issues are caused by one of three internal cables
To check these cables
1. Press the PC power button for 15 seconds, or until the PC goes fully off.
2. Turn off the PSU at the back of the PC (The switch can be found at the bottom of the case where the power lead plugs in).
3. Remove the Mains Power Lead
4. Lay the PC flat on its side so you can work confidently & comfortably
5. Remove the glass side panel
6. Make sure the black power cable to the motherboard is fully plugged in and clipped in. A short video explaining connections: https://youtu.be/0QsaQOExrZA
7. Make sure the CPU power cable is fully plugged and clipped in, this can be found on the top left corner of the motherboard. it's a black square cable with four pins.
**Please don't just visually check these 3 cables. Physically make sure all 3 cables are firmly in place by either pushing them down firmly or unplugging them and reseating them firmly**
8. Make sure the CPU fan is fully pushed down and flush with the motherboard.
9. Reinsert mains power lead & turn PSU back on.
10. Turn the PC back on using the Power button on top or the front of the PC. Just press the button once to turn on, no need to hold it down.
If you are still having issues, check the connections for the ON/OFF button & Power LEDs
https://www.support.drmem.com/hc/en-gb/articles/360018374878-PC-Case-Connections-1
Then if you are still having problems check the CPU fan is securely held in place
https://www.support.drmem.com/hc/en-gb/articles/360020966957-CPU-Fan
Once you have checked the cables and CPU fan, check the memory
https://www.support.drmem.com/hc/en-gb/articles/4402319051793-Support-Article-Memory-Check-
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