How can I avoid problems with CPU power?
When I attempt to turn on my newly built custom computer, it powers on for 5 seconds then turns off again. The only happens when I have the ATX CPU power cable connected. When this cable is removed and the CPU isn’t powered, the motherboard powers on but doesn’t do anything.
- CPU: Intel Corp i5 7400
- GCard (the same with or without the GPU): Asus NVIDIA GTX 1050 Ti
- RAM: 16 GB (2x8)
- Motherboard: Gigabyte Z390M Gaming
This is not overheating, as the CPU doesn’t even seem to turn on!
Solution 1:
Your CPU is not compatible with your motherboard. It is from a previous LGA1151 generation and your new motherboard chipset does not support this CPU.
Your Intel i5-7400 processor is a Kaby Lake processor which is not compatible with the 300 series chipset on your motherboard. You will need an LGA1151 Revision 2 CPU, something from the Coffee Lake range. An equivalent CPU would be either an i3-8100 or an i5-8400. Either of these would be an improvement over what you currently have (and would actually work).
See this chart from the Wikipedia Article on LGA1151 processors:
https://en.wikipedia.org/wiki/LGA_1151
You can also verify this by checking the CPU Support page listed on your motherboard manufacturers website:
https://www.gigabyte.com/Motherboard/Z390-M-GAMING-rev-10#support-cpu
(Unfortunately the table is too large to screenshot, however the minimum currently supported i series CPU is the i3-8100t)