Pc keeps rebooting

[The321]

Soo since my laptop is super old I wanted to build a Pc. Soo I bought all the parts and put it together. When I press the start button the fans spin at 100% for +- 8 seconds and than it shuts down and the process repeats. Idk what' causing the problem. The cpu is a g1840 the motherboard has a 8pin cpu input but I use my 4 pin from psu since people told me it will work with the 4 too. The psu was used to power a heavier load before. Can someone help me with finding the problem ?

[BlueChinchillaEatingDorito]

15 minutes ago, The321 said:

Soo since my laptop is super old I wanted to build a Pc. Soo I bought all the parts and put it together. When I press the start button the fans spin at 100% for +- 8 seconds and than it shuts down and the process repeats. Idk what' causing the problem. The cpu is a g1840 the motherboard has a 8pin cpu input but I use my 4 pin from psu since people told me it will work with the 4 too. The psu was used to power a heavier load before. Can someone help me with finding the problem ?

Clear the CMOS and let it do its thing. Make sure you have everything needed to boot so CPU, RAM, Power.

[Christophe Corazza]

Do you see any post codes on your motherboard?

 

The 8 pin is mainly for high powered systems. The 8 pin connector is literally designed as two of the 4 pin connectors put together. It is entirely possible to just plug the 4 pin connector in the 8 pin slot. It won't damage anything, but the motherboard will detect the difference and either not start up at all, or run in a VERY restricted mode.