7970 LCD screen does not display anything

Hi everybody,
When I power up Cisco IP phone 7970,these button flashes in sequence:
headset, mute and speaker. Then line keys start flashing green in sequence. Then headset button start flashing green.After 15 seconds everything stops. Switch Catlyst Express 500 sees through CDP protocol IP phone 7970, but IP phone doesn't get IP address from DHCP server.When I try factory reset, after all line keys flashe yellow, I press 123456789*0#, line keys don't flashe red but green. And again after 15 seconds, everything dies. What is wrong with my phone?
Best regards,
Marija

Hi
I had a phone in a similar state, it was completely useless... I built a console cable for it, and could see it trying to TFTP a particular image from the server - this image wasn't on the server and I'm sure it never was... I suspect it must have been the original load or something.
Anyway - make a serial cable, and plug it in. Start up the phone, and see what the debug shows you - it's quite easily readable.
You should be able to see where it fails. To fix mine I had to put the software it was looking for on the TFTP server and it fixed itself - I had to get someone on this forum to supply me the software as I couldn't find it anywhere...
Serial Cable (same for 7970 and 7960 regardless of software):
http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/prod_troubleshooting_guide_chapter09186a0080558541.html#wp1041428
Aaron
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