Cant connect to internet after reinstalling Vista

I have an HP EliteBook 8530p. Vista Business 32-bit. i ve formatted it
and reinstalled the OS from the manufacturers recovery option. Before
the format the internet connection was working fine but now i cant make
it work. All the drivers are working as all the devices as well. (Wired
LAN connection). i ve already talked with an hp techician that told me
its the ISP problem and the laptop is fine and with a techician from the
ISP that told me its a hardware malfunction. Getting a bit desparate
once again! any ideas?

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