Fans come on 4a second and shut off wont boot

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The "fan twitch" you're seeing is a nearly certain proof there is a short circuit somewhere. It could be the PSU, it could the the motherboard, or anything directly connected to either or both of them.

You need to reduce your machine to PSU + motherboard (out of the case/on the table) + CPU (with heatsink of course) + one stick of RAM + video card (if there is no integrated graphics). Reset CMOS, re-seat your CPU, cleaning the old and applying a new coat of thermal paste as needed, re-seat RAM and a video card if needed, then try turning the machine on. You can use a screwdriver head to short the power-on pins on the front panel pinout of the motherboard, if it doesn't have a dedicated power-on button on it.

If it still just twitches the CPU heatsink fan, remove graphics card (if you used one), connect a speaker to the front panel pinout (if the board doesn't have an integrated speaker/buzzer on it) and listen for an error code. If you didn't need a video card (have onboard/integrated), then remove the RAM stick and listen for an error code, if the machine even starts.

Reducing this to PSU + motherboard + CPU problem, means you should try a different PSU. If the machine still doesn't spin the fan, your motherboard is shorted somewhere, probably the VRM.

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