Power does not go to the hard drive. - Maxtor USB 2.0 External Enclosure + Hard Drive 200GB /ATA133 7200 RPM 16MB 6B200R0/6B200RO (NEWITEM46743489) Drive Case

External hard drives are plug-and-play devices used to store music, video and data files. Once the drive is connected, the computer checks its systems for the appropriate drivers, loads them, and the external drive is ready to use. If the computer does not recognize the external drive, plug it into another computer to ensure the drive is not corrupted. If the drive is good, a few simple steps should help re-enable the drive for use.
Switch the power button to "off." Disconnect the power cord from any extension cords or power strip, then re-seat the power cord into the hard drive. Connect the cord directly into an outlet and power up the drive. If the drive is powered and still not working, check the data cable. Power down the hard drive and disconnect the data cable from the computer. Wait 30 seconds to one minute. Reconnect the data cable and power up the drive. If the drive is not detected, power down the hard drive and connect the cable to a different port. Power up the drive. If the drive is detected but not working, check for a missing driver. Click on the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Select "Device Manager" and double-click "Disk Drives." Right-click the yellow exclamation point and install the missing driver. Close the Device Manager. If the drive is detected but not working check to ensure it has an assigned drive letter. Disconnect all devices connected by USB cables from the computer. Reconnect the drive's data and USB power cables directly into the computer. Click on the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Click on "Disk Management," right-click the external hard drive, click "change drive letter and path," and click "Add." Assign a drive letter. Avoid using A, B or C (C is usually assigned to the computer's internal hard drive). Click "OK" close the window. If the drive is detected but not working, check whether the drive is in sleep mode. Disconnect all devices connected by USB cables from the computer. Reconnect the drive's data and USB power cables directly into the computer. Click the "Start" button, right-click "Computer" and select "Manage." Enter your administrator password if requested. Select "Device Manager" and double-click "Universal Serial Bus Controllers." Double-click the first instance of "USB Root Hub" or "Root Hub." Check for the hard drive. If the drive is not visible, move to the next instance of "USB Root Hub." Continue checking each instance until the hard drive is located. Once located, click the "Power Management" tab and uncheck the "Allow computer to turn off this device to save power" box, click "OK," then close the Device Manager. Power the computer down, wait 30 seconds to one minute, and power the computer back up to ensure the drive is detected. Hope this helps.
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unplug the power chord then push and hold power button to drain all residual power. disconnect hard drive power supply for ten seconds, then reconnect. plug tower back in and power up again.

yes you need power to the external hard drive whether ide or sata possibly depending on your hard drives power supply
12V+5V AC sata Adapter Power Supply HDD HARD DISK DRIVE
hope it helps

Hi,
I have had problems like this many times with some of my IBM machines. What i find most often the reason the bios will not recognize them is because the hard drive has gone bad.
Troubleshooting 1. Unplug power cable from computer before doing anything inside of the computer. Unplug sata cable from motherboard and hard drive. Unplug power cable from hard drive.
Plug the sata cable back into the motherboard and into the hard drive. Plug the power cable back into the hard drive. Plug the power cable back into the computer.
Boot computer and enter bios(by pressing F8, Enter, Del ect..) Does the hard drive show in there now?
2. If you have another hard drive.
Unplug power cable from computer before doing anything inside of the computer. Unplug sata cable from hard drive. Unplug power cable from hard drive.
Plug the sata cable into the second hard drive. Plug the power cable into the second hard drive. Plug the power cable back into the computer.
Boot up the computer and enter the bios. Does this hard drive show in the bios? If so then i would say that your original hard drive has gone bad.

Check your connection between the power supply and the motherboard. Is it possible that your power supply was getting weak instead of the hard drive you replaced? First check the power connection and then try another power supply. If a different power supply boots the computer then you know that it may not have been a problem with your hard drive. You didn't say why you replaced the hard drive.

Have you got the original power adapter?
If so the voltage details are printed on the label on the bottom of the adapter.
If the external USB Seagate hard drive houses a 31/2" drive then it requires an power adapter that provides +12 volts and +5 volts both supplying approx 2000mA of current.
If the Seagate uses a 21/2" (laptop) hard drive then it only requires +5 volts power adapter.
The only problem is the power connector to the external drive, make sure it suits the external hard drive unit and the power pins are correctly wired for the Seagate. If the polarity of the plug is incorrect lt wired (ie reverse polarity) then it could damage the USB hard drive and adapter case.

turn off xbox unplug pwer supply disconnect hard drive, wait 1 mintue. connect hard drive connect power supply turn power on.. if same problem disconnect power supply disconnect hard drive. connect power supply insert disc if game plays without any problems you might have a bad hard drive .(800) 4MY-XBOX

I have my own Seagate hard drive and with mine you have to plug it into the computer and power source for it to power on.

I also have a Monsoon 320GB hard drive.  There is a power cord that attaches to the hard drive and the power source, make sure that the drive is turned off, plug the power cord in to the drive and the power source.  Mine came with two types of connectors to connect the hard drive to the computer.  Firewire to Firewire and a usb cord.  Use one of the cords to connect the hard drive to the computer.  Then turn your drive on.  If an icon doesn't show up on your desktop you can restart your computer, that usually works for me.  The drive functions just like your internal hard drive.  If you want to save files on the external drive just choose that option when saving a file.  Hope this helps.

usb cable provides power to your hard drive.

try to use new cable.

hopes it works.

pls. confirm