External HDD not detected by computer?

I lately bought a new external samsung 100gb HDD abt 7hrs rear legs. The guy at the store formatted it n everything. The HDD is inside a A1 Pro casing n is connected to my computer through a USB2.0 cable.

although the pale on the HDD is on, (not blinking) green in color, my computer is not detecting the External HDD.

i enjoy gone to control panel n gone to device manager, tried to detect change in my computer, tried installing alien hardware, and even plugged into all 3 of my USB ports contained by my computer.. none of the above seems to serve..

please help me!!

Answer:
If you enjoy just bought consequently you will have guarantee interval with that HDD right? shift back to shop relate them your problem ask them to solve and they will do.

Don't ask here go posterior to shop save time.
Are you competent to plug in other USB devices into your computer?

Does your computer support USB 2.0?
Open system properties by right clicking on the "My Computer" deity and selecting properties. From here select the hardware tab then select the "Device Manager" button. In the device administrator window look and see if any devices are nominated that have pale question grades. Most likey you need to install/reinstall the drivers for the USB Root Hub.

Try to find a working USB port by plugging a different device into one of them. (A printer might work).

Is your system pre-fab (for example a Dell or HP) or assembled by you or someone you know?

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