Help Samsung Galaxy S3 does not appear on Windows computer or Mac?

[PavSIdhu]

I'm trying to unlock a Samsung Galaxy S3 Gt-i9305 on EE running Android 4.3. I know how to unlock the phone however, when I connect the phone to my computer it does not appear at all. Usually, Android phones have a notification saying the phone is connected as a media device or something but it doesn't appear.

I've tried this on Windows 10 technical preview and Mac Yosemite. I've tried the following:

• Installing new drivers (however I don't know if they were the correct drivers I tried several though)
• Installing Kies and updating to the latest version on both Mac and Windows
• Putting my phone in download mode to download drivers (no drivers downloaded)
• Restarting the phone and taking out the sim

Is there anything else I can possibly do? Is it a hardware problem? I don't have USB debugging on either. Thank you for your help.

 

[Mikestony]

Hello!
Try a different cord or usb port?