I have a 160 GB Seagate usb hard drive that I need to retrieve data from. It will not power on, so I figured it must be a problem with something in the enclosure and not the drive itself. I removed the drive from the enclosure and connected it to a different pc. With the additional hd attached, the computer will not power on. I unhooked everything except the two hard drives and the motherboard, still nothing. When I remove the added drive it still will not power on until I unplug the power cable from the power supply and plug it back in.
I tried the same procedure with two other pc's with the same result. The last one I tried had a 450 watt power supply. Same thing happens. The pc will not even turn on, even with only the motherboard and two hard drives attached.
I find it hard to believe that the hd is sucking so much juice from the PS that it will not allow the pc to power on.
The hd came from an external usb drive. It is a Seagate barracuda 7200.9 160gb ultra ata. Model # ST3160212A. Label says +5V 0.46A, +12V 0.56A. Every time I have tried it I have used the hard drive on a seperate data cable.