T500 Ethernet Port do not recognize cable

I am testing a T500 with Windows XP (from recovery DVD). I did the following:
1) Connect it by ethernet cable to my DSL router. The connection establishes.
2) Connect it with the same cable directly to another computer. The connection establishes. This means, that the ethernet chip correctly changed the pins automatically, because normally one would need a cross-link cable for this.
3) Connect it again to the DSL router (the ethernet chip now has to change the pins back). No connection establishes. The LEDs at the T500 remain dark. I have to restart the T500 to establish the connection again.
I have the newest ethernet driver (9.52.10.1003). The problem was confirmed with different cables. The behaviour is always the same. After step 3, another computer has no problem to connect to the DSL router with the same cable end. Therefore I would exclude an influence of the router or the cable.
Sometimes even directly after start, the cable plugged in is not recognized.
Could this be a hardware problem?

By the way: In the last time, sometimes the green LED near the camera switched on without any camera program visible running. Is this indicating, that a (hidden) program is using the camera?
Whenever the light status of the camera is on, that means that your or some program have turned on the camera and it is now active, so yes something or someone is using your camera. Although.... on my model the light of the camera IS red when you turn it on. Are you talking about the status light bars like the moon crescent (sleep), bluetooth and what not?
ping 127.0.0.1 brings a response within less than a ms. Does that mean, that the ethernet hardware was found?
That implies that the hardware does work (if it can reconize the cable)
ipconfig /all brings up a MAC adress but no IP-Adress of the ethernet. (I set a fixed home adress for this before.)
If you have an IP address then the lights are on, so we are confirming the situation.
Have you tried The Network Connections Applet in the Control Panel? (Hit Windows + R Key, type ncpa.cpl) Check if you have a Local Area Connection (I beleive its Intel Gigabit or something of that nature) under that panel. If you don't.... there might be other problems. If there is then disable and re-enable the connection and see if the lights go on. I'm guessing there's a faulty detection device.
T500 2081 CTO ~ T9600 2.8GHz ~ WXP Pro 32bit ~ WSXGA+ 15.4 LED ~ATI 3650 ~ 4GB DDR3 RAM ~ 500GB WD 7200rpm
Camera ~ AT&T WWAN ~ CD/DVD Combo Drive ~ Intel WiFi 5300 AGN

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Attachments:
2012-12-28 16_50_14-Driver Software Installation.jpg ‏37 KB

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Dah•veed

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