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What size is the hard drive?
Do you know what motherboard you have?
STEP 1: CHECK POWER (click for expanded instructions further down the page)
Verify that the drive light and the light on the AC adapter (power supply) is illuminated normally.
It is sometimes necessary to contact Technical Support for troubleshooting and/or possibly to replace the power supply if it behaves unusually.
STEP 2: CHECK CABLING (click for expanded instructions further down the page)
Confirm that your USB/Firewire cable is firmly connected in a port that is on the rear of your desktop computer (if you have a desktop).
Try another USB or Firewire port.
If your drive is powered only by USB, such as the FreeAgent Go, the Maxtor OneTouch mini, and the Seagate Portable drive, then the drive's cable has two USB connectors. Try connecting both of the free USB connectors into a USB port for maximum power availability.
Avoid connecting the drive via a USB hub for now.
STEP 3: WINDOWS SERVICE PACKS
Follow these instructions to ensure that your installation of Windows XP/2000 has been updated to the latest Windows Service Pack.
Right-click on My Computer and choose Properties.
The System Properties window will appear. On the General tab (which will be at the front), see the "System:" information.
For Windows 2000: Update to Service Pack 4.
For Windows XP: Update to Service Pack 2.
Allow your computer to complete the installation of the Service Pack.
Reboot the computer and connect the drive. Turn it on and see if the drive is detected now.
STEP 4: CHECK DISK MANAGEMENT (click for expanded instructions further down the page)
Check Disk Management to see if the drive is detected there.
Right-click on My Computer, select Manage, select Disk Management.
Check the upper window to find whether the drive letter is present.
Check the lower window to find whether the drive is detected (such as, Disk 1, Disk 2, etc).
If it is detected as with a drive letter, verify no other device is already using that drive letter. If it is, change the drive letter of the external drive to some unused letter (click here to see more instructions on how to do so).
If changing the drive letter is not possible or the drive does not have a drive letter at all, attempt to reformat the drive (click here to see more instructions on how to do so). This will erase any data on the drive, but since the drive is brand new, there is nothing to erase on it.
If it is still not detected, proceed to Step 4.
STEP 5: CHECK DEVICE MANAGER (click for expanded instructions further down the page)
Verify that your Windows installation contains the most recent Service Pack.
In the left column of Computer Management, click on Device Manager.
Look for the drive’s model number/name in Disk drives (a category under Device Manager).
It will probably not be there. If it is, test the drive on another computer if you can.
If it is not there, check under Other devices (a category under Device Manager).
If under Other devices an Unknown device appears, double-click on it.
Under the General tab, we would expect to see "This device is not working properly" and either (Code 28) or (Code 10).
If Code 10 appears, the drive has most probably failed.
Double-check that you have installed the most up-to-date Windows Service Pack.
Verify by trying the drive with another USB cable or port, or on another computer.
If none of this gets the drive detected, you can begin a replacement order online, or, since the drive is new, you can usually exchange the faulty unit for a replacement at your place of purchase (please contact the place of purchase for a full explanation of their policy regarding returns).
If Code 28 appears, you will need to test the drive on another computer. If the drive works fine on another computer, follow the procedure in this Knowledge Base article’s Step 11.
STEP 6: CONNECT TO ANOTHER PC (click for expanded instructions further down the page)
The final troubleshooting step is to rule out any problem with the computer itself. This is most easily accomplished by connecting the drive to another computer that has either Windows Vista or XP/2000 (not 2000 Server or 2003 Server). If similar symptoms follow the drive to the 2nd computer, the probability that the drive is faulty is increased.
If similar symptoms do not follow the drive to the 2nd computer, the problem may well lie in the original computer. You will then need to start further troubleshooting on the computer itself.
Do you know what motherboard you have?
STEP 1: CHECK POWER (click for expanded instructions further down the page)
Verify that the drive light and the light on the AC adapter (power supply) is illuminated normally.
It is sometimes necessary to contact Technical Support for troubleshooting and/or possibly to replace the power supply if it behaves unusually.
STEP 2: CHECK CABLING (click for expanded instructions further down the page)
Confirm that your USB/Firewire cable is firmly connected in a port that is on the rear of your desktop computer (if you have a desktop).
Try another USB or Firewire port.
If your drive is powered only by USB, such as the FreeAgent Go, the Maxtor OneTouch mini, and the Seagate Portable drive, then the drive's cable has two USB connectors. Try connecting both of the free USB connectors into a USB port for maximum power availability.
Avoid connecting the drive via a USB hub for now.
STEP 3: WINDOWS SERVICE PACKS
Follow these instructions to ensure that your installation of Windows XP/2000 has been updated to the latest Windows Service Pack.
Right-click on My Computer and choose Properties.
The System Properties window will appear. On the General tab (which will be at the front), see the "System:" information.
For Windows 2000: Update to Service Pack 4.
For Windows XP: Update to Service Pack 2.
Allow your computer to complete the installation of the Service Pack.
Reboot the computer and connect the drive. Turn it on and see if the drive is detected now.
STEP 4: CHECK DISK MANAGEMENT (click for expanded instructions further down the page)
Check Disk Management to see if the drive is detected there.
Right-click on My Computer, select Manage, select Disk Management.
Check the upper window to find whether the drive letter is present.
Check the lower window to find whether the drive is detected (such as, Disk 1, Disk 2, etc).
If it is detected as with a drive letter, verify no other device is already using that drive letter. If it is, change the drive letter of the external drive to some unused letter (click here to see more instructions on how to do so).
If changing the drive letter is not possible or the drive does not have a drive letter at all, attempt to reformat the drive (click here to see more instructions on how to do so). This will erase any data on the drive, but since the drive is brand new, there is nothing to erase on it.
If it is still not detected, proceed to Step 4.
STEP 5: CHECK DEVICE MANAGER (click for expanded instructions further down the page)
Verify that your Windows installation contains the most recent Service Pack.
In the left column of Computer Management, click on Device Manager.
Look for the drive’s model number/name in Disk drives (a category under Device Manager).
It will probably not be there. If it is, test the drive on another computer if you can.
If it is not there, check under Other devices (a category under Device Manager).
If under Other devices an Unknown device appears, double-click on it.
Under the General tab, we would expect to see "This device is not working properly" and either (Code 28) or (Code 10).
If Code 10 appears, the drive has most probably failed.
Double-check that you have installed the most up-to-date Windows Service Pack.
Verify by trying the drive with another USB cable or port, or on another computer.
If none of this gets the drive detected, you can begin a replacement order online, or, since the drive is new, you can usually exchange the faulty unit for a replacement at your place of purchase (please contact the place of purchase for a full explanation of their policy regarding returns).
If Code 28 appears, you will need to test the drive on another computer. If the drive works fine on another computer, follow the procedure in this Knowledge Base article’s Step 11.
STEP 6: CONNECT TO ANOTHER PC (click for expanded instructions further down the page)
The final troubleshooting step is to rule out any problem with the computer itself. This is most easily accomplished by connecting the drive to another computer that has either Windows Vista or XP/2000 (not 2000 Server or 2003 Server). If similar symptoms follow the drive to the 2nd computer, the probability that the drive is faulty is increased.
If similar symptoms do not follow the drive to the 2nd computer, the problem may well lie in the original computer. You will then need to start further troubleshooting on the computer itself.