Blank Screen after factory reset 7911 phone

Hello guys,
I had a weird issue on an 7911 ip phone. It was connected to my network and on the display of the phone was saying "ethernet disconnected".
What i did was a soft and a hard reset using 123456789*0# and then 3497672850*# following the guidelines of a conversation in the forum
https://supportforums.cisco.com/thread/2166581
After the factory reset the device has a blank screen (I left it for more than an hour connected on the network bearing in mind that some processes might be loading in the background and the firmware will load at some point..that didn't happen) and it is unable to receive an ip address ("show ip dhcp bindings", shows nothing related to the mac address of that device).
To eliminate the possibility that the problem might be on the network card of the phone, i've factory reset a working phone using the above described procedure.
I had the same problem with that phone too.
Are there are any log commands that i can use to further investigate my issue? (I can't see any logs using "terminal monitor"command)
I am using call manager express 4.3.0 on a cisco 2800 router.

Dragan,
I tried what you suggested with no luck.
What i noted is that, when i plug the power adapter on the phone and connect the ethernet cable on the switch port of the phone (the other end goes to a d-link small switch) the light on the small d-link switch doesn't come up. However if i plug the ethernet cable on the pc port of the phone the light goes green. I checked it with two phones that i've factory reset and it is the same problem.
What i understood from this, is that the pc is unable to retrieve an ip from the dhcp server and the necessary option 150 to locate the tftp server and retrieve the necessary firmware.
Gordon, due to the above mentioned problem i can't proceed with wireshark since i don't have network connectivity between the phone and my workstation.
Guys, do you have any alternatives that i can give a try?
Thanks a banch!

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Blank Screen after factory reset 7911 phone

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