i bought a new PSU 650watt....put in case hooked cables up plugged in green light on mobo came on hit power button one fan spun then just stopped and nothing happened??? got frustrated and put old stock 300watt psu back in and computer fired right up no problems...any ideas here would be greatly appreciated please and thank you... computer is an HP pavilion elite 210y amd 945 quadcore 3.0ghz 8gig ram H-RS880-uATX (Aloe) motherboard