4 gb pendrive led glows but now shown in my computer, i tried to check in many computers and laptops but the same problem. please help me.

If Pendrive is glowing but not detected by the system, it may depends on the operating system you are using.
If it is linux then try mounting it first ...use command
---> fdisk -l and look for that drive.
--->then mount /dev/sdb,

To Correct this problem, Right Click on "My Computer" and Choose "Manage". Choose Disk Management. The name of your USB-Pen Drive should show up on the list of "Disks".
Right-Click on the Name of your USB-Pen (The part to the right) and choose "Change Drive Letter and Paths..."
It will show your drive letter as E:, most likely!
Select "Change" and choose a letter you are not using.
It will warn you that if you make this change, you may loose info.
(This applies if you already had a good link to the drive and were using it!)
Click Ok, and your USP-Pen should Pop-Up!


one another way is try downloading that usb software from internet and then try using pen-drive...
ur pendrive is glowing which means its working , if it prompt a message "usb unrecognized" then seriously you need to worry

Umm, how old are your computer and laptops that you're using to check?
It could be that they don't have a USB 2.0 port.

Is there any message at the bottom right of your computer when you plug it in saying anything related to a USB device.

Also you can click on Start/"right-click" My Computer/Manage/Device Manager/Universal Serial Bus Controllers --- make sure that this says it's working properly and enabled.