pc not booting up

[tive]

hi all

please help when I switch my PC on the fan kicks in and then within seconds switches off and will not boot up.

 

[vix]

What CPU? Motherboard? BIOS version? Are there other symptoms? Does the system light up when the fans spin up? Does the system POST? Did it work previously, or is this a new build?

Bottom line: we need more information.