my utm120 is broken

Hello Hyun-wook Hong,

Thank you for reaching out the the community,  ASG/UTM Series Appliances is declared EoL - 30-Jun-2018

https://support.sophos.com/support/s/article/KB-000035279?language=en_US

And you have already tried re-imaging the appliance, right?  

During the re-image process - what is the error or display page you receive when unsuccessful ?

yes, i know it reached eol yet.

at first, as i wrote before i can't see anything during reimage progress. i just confirm by hdd light. keep turn on hdd light i consider the firewall is being reimage.

after complete reimage(maybe) hdd light turns off. and i push power switch, no response. i keep push power switch some seconds, firewall turns off.

after that, turns on, make sound little beep, and no response. ever no hdd access. if i push power s/w, it turns off immediately.

yes, i know it reached eol yet.

at first, as i wrote before i can't see anything during reimage progress. i just confirm by hdd light. keep turn on hdd light i consider the firewall is being reimage.

after complete reimage(maybe) hdd light turns off. and i push power switch, no response. i keep push power switch some seconds, firewall turns off.

after that, turns on, make sound little beep, and no response. ever no hdd access. if i push power s/w, it turns off immediately.

Hey Hyun-wook Hong,

Based on that you can refer the number of beep sounds made my appliance and you can determine the issue: - https://www.lifewire.com/amibios-beep-codes-2624543

sorry. it isn't related to my case. though display out doesn't work, it pass bios test. in fact, if i press del key as soon as turn on, it enter to bios setup(it can see. display well) how strange!

I would try to replace the HDD.