IPhone not recognized by most computers

Hi,
My problem:
iPhone 4 32GB is not recognized at all by the computer. A popup shows up: Unknown Device.
Tried:
- replacing the dock connector
- completely restoring the device
- putting it in DFU mode
- PC ánd Mac
- different cables
- latest updates of iTunes
- Apple help guides
Extra info:
- I've found two computers (Windows) where the iPhone was flawlessly recognized (both before and after replacing that connector).
- It's not fake.
- Problem occured during 5.0, 5.0.1, 5.1 (don't know if it did when running 4.x, but I assume it did)
- iPhone worked perfectly for its previous owner (she used it in Holland), but when I bought it, the problem occured at my pc (I use it in Belgium).
- iPhone is completely simlock free and not jailbroken.
- other iPhones can connect with the same computers.
Could this be an iPhone-hardwareproblem? I'm really stuck here.
Thank you for your help!

The problem persists.
I plugged it into my sister's Macbook Pro, popped right up, so I figured I'd run a "restore" thinking it'd clean out the cobwebs. Turns out that was a terrible idea because now I not only have a phone that I can't put anything onto, but it's empty as well: No music, no videos, no photos, no contacts.
I completely uninstalled iTunes and reinstalled it. Plugged the phone back in. Things were looking up because it "binged" for the first time in a while on my computer. Tried syncing some photos to it. Worked for about 30 seconds then this popped up:
Phone disappears from iTunes, though the phone itself still says "Sync in progress." Now it doesn't acknowledge a connection at all anymore.
I'm tempted to put the thing back in the box and try to return the whole shebang, even though I'm like a week past the return policy. Piece of Garbage.

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DR2238 wrote:
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For Windows, see this... http://support.apple.com/kb/TS1495
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I have synced my phone before with my iTunes just fine, but lately I've had issues. I plug my phone into my computer and it charges it just fine, but no trust notification or anything has shown up. No indication of it being noticed at all happens. Now before you answer, let me explain some things;
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When you removed and reinstalled iTunes, did you do it by following the instructions in this support document? Remove and reinstall iTunes and related software components for Windows Vista, Windows 7, or Windows 8 - Apple Support
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I understand why Apple doesn't cover the water damaged phones under the warranty, but do you know why they don't fix them if the customer is paying? Is it just because they want the people to buy another phone so they can make more money? I guess I just don't get it.
The cost to repair a device and all of its components is more than the cost of a new device.
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+"US v1.0+
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IPhone not recognized by most computers

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