External Hard drive not detecting in Windows 7

Hi, I have a Windows 7 Ultimate 32 bit. I have 2 external hard drives. I can use the first one but the second one, I can't use it. It works in Windows XP, but not on this one.
When I insert it, the green light on the HD is on but I can hear no sound, the sound I usually hear when I insert the other HD. There is no activity on the computer, neither can I see the HD from the My computer.
I tried looking for solutions online but none of them helped. Attached are the screenshots which might help. I cannot delete the content nor can I move it to my computer as I have no space. Thank you for helping me.

Hi allen2013,

Welcome onboard.

Forget about the first one which can be seen and worked with on both XP and Windows 7. Please pull that out and keep it far away beyond your reach.:)

Now tell us the manufacturer/make/ model/ capacity of the problem drive - the second drive.

Tell us whether it worked on Windows 7 before.

Safely remove all other USB drives/Card Readers on your Windows 7 PC - I presume it is a desktop. Just plugin your problem drive only and post a fresh screenshot of how it looks in Windows Management.

The External HD is Serial ATA-1.5GBps eSATA-3Gbps, 500 GB and there is 'Windows 7' written on the Hard drive. I guess it does support Windows 7. I haven't tried this on any other Windows 7 computer.

No manufacturer's name?? No model Number?? Can you not read the label on the external drive and give all the details? Please furnish the details asked for.

Your screenshot doesn't help in anyway for I do not know what is Disk1 and what is Disk2.

Do you have a card reader plugged in?

Now please do the following.

Pull out all USB drives/card readers(safely remove) and post a screenshot of Windows Disk Management of just the PC.

Then connect your first external drive - which works - and post a screenshot of Windows Disk Management.

Then connect your second external drive - which you say does not work - and post the screenshot.

So in all you will be posting three screenshots.

Let me see whether I can decipher something.

Also update your System Specs with correct details.

The 2nd screen print in post #1 shows there are 2 devices with errors.
I think you need to get your MB SM Bus controller driver installed...
I can't tell from your system specs what you have...

I'm sorry as it seems I didn't answer all that you asked. After close inspection, I found out that brand of the 2nd HD(which is not working) is FC CE (Freecom), which is also the model of the 1st HD(which is working). You'll have to believe me when I say that there is no model no. written on the HD. I have no card reader and it's a desktop. Attached are the three screenshots.
1. The first screenshot is of the PC without any USB HD attached.
2. The second screenshot is of the 1st HD which is working, 160 GB Freecom.
3. The third screenshot is that of the 2nd HD which is not working, 500 GB Freecom.

I hope it helps and thanks for replying to my post.

My desktop is Windows 7 Ultimate 32 bit, 2 GB ram and 500 Gb hard disk. Intel(R) Celeron(R) CPU G550T @2.20 GHz. It's HP.

So you have an HP computer, right?
Do you know what Model it is?
Hopefully it's shown on a sticker on the PC.

I would get the device errors fixed.
If you are missing device drivers for the SM Bus and/or Chipset it can cause problems.
Maybe fixing the device errors will correct the HD issue???

Without knowing the Model/Number of the PC I can't help you find missing drivers.
Here is a link to USA HP Support for Drivers and Downloads.
You can go there and try and find drivers for your PC.
If you don't know the Model or Number, click on the "Find Now" button.
HP Drivers and Downloads for Printers, Scanners and More | HP ® Support

If you can't find the pci simple communications controller (or any) driver on the HP site see this tutorial:
Driver selection for your Hardware devices.

Your SF specs show the Manufacturer/Model is LG, and the CPU is Dell.
Change the manufacturer to HP and add the Model.
Change the CPU to Intel Celeron G550T.

Did the PC come with Win 7 Ultimate pre-installed from the factory (HP)?
Or, did you or someone else install Win 7 Ultimate?
Is the OS activated and fully updated?

I received this external hard disk a few weeks back from my cousin. I called him today and told him the problem which I'm facing. He said it happened to him also, he said it's not the problem of the computer, it's the problem of the USB port of The HD. I also realised that the USB port of the HD is quite unstable.

He said, he once couldn't use the HD for over a month. He asked me to change the USB cable, which I did, because I have a spare and tried connecting it, it still did not work.

He assured me that it was not a computer nor an O.S problem because he used the same HD on a Windows 7 PC also. I guess the port of the HD needs to be repaired.

In any case, I am thankful to you guys for helping me out. I wouldn't have asked for your help if the green light was not switched on when I connected to the computer, which led me to believe that it was a computer problem.

Thanks a lot guys. And I apologize if I've wasted our time. We were on the same boat.