I wud know about Voltage Regulator module in a server...I face frequent hangups in my servers while heavy processing...no display in monitor even after restarting the server...I also face frequent hard disk failures...I use IBM e-Server...Wehn contacting my service personnel, he says that there might be problem in VRM(Voltage regulator module)...I also tested the server's performance in low temperature room (18'c to 22'c)...But if the room temp exceed 25'c, the server hangup...can any expert suggest me a solution for this...any hardware upgradation required...