My kids computer has an ATX100-5 PUS, which must be at least 8 yrs old (HP Pavilion 4445). After a cpu upgrade a while back, now recently a new wireless card, the psu appears to have died. PC will not power up, even POST (power light on front just flashes). My multi-meter reads 5.32v on the 12v leads and 2.31v on the 5v leads. Time for a new one or something else wrong? PSU fan spins very slowly and cpu fan will not eben run.