I have a customer with a XTS-IP with a External Digital Voicemail model DHD-04 that has a problem. We tried a reboot and that does not help. When powering up the unit all 8 of the port lights come and stay on bright. I connected my pc to the unit with the null cable and get nothing. The last few times we tried to reboot the lights would only come on about every other time. Any idea what we could do? I have a DHD-04 that boots up fine, but it's a bit older than the unit they have and was wondering if there is a way to use the flash drive from the unit that will not boot in the older unit that has a hard drive. Thanks for any help you can offer.