Need to know what to do to fix this .
The problem is when I trun on my computer the power goes out in my home

Please define, "Power goes out"!

Do the Main Power breakers trip, cutting power to the entire panel?

Does only the computer room breaker circuits trip?

What size load are you trying to start up?

Try adding each component of your computer system one at a time when powering it on. Don't flip one switch on and turn everything on.

Get the information off the nameplates if there are any that tells you the required amperage and also the "Instantaneous ON" amperage draw.

Also, make sure that your home is receiving the correct levels of power from the Power Company.