The thread at this link http://www.pcguide.com/vb/archive/i...hp/t-15160.html delt with the issue I am having, except the difference is that person was not having any reboot or shutdown problems, and I am. My computer randomly reboots for no obvious reason. My system is an Athlon XP 1500+ Palamino, with 768 mb DDR RAM I have recently replaced my power supply with an Antec 300w supply. The random rebooting occurred before my old supply died and I bought a new one, but perhaps the issue is still related to the power supply. I downloaded MBprobe to get readings on temp and voltages, and here are the current readings... Voltage--- vccp1 1.76 vccp2 2.46 +5Vsb 4.95 +3.3V 3.23 +5V 4.92 +12V 12.03 -5V -5.76 -12V -11.68 Vbat 3.36 The readings labelled "Vccp2" and "-5V" both have flashing red indicators next to them, with MBprobe warning threshold set at 10 percent. Any help would be appreciated.