i am rebuilding my computer and i have startup issues. i have a new mobo, anew video card, new hdd, new psu. i put all of it together , go to start up and nothing. all the fans spin for 1 sec and immediately shut off. thought i had too much hooked up for my psu to handle, so i disconnect some things. with only mobo and heatsink fan attached ,no forward progress. still wont start. help me please