Zywall appears to be offline

Hi all
I have currently a Network set up with Cisco router 800 series on SDSL connection connected to a Firewall Zywall 70

the zywall 70 is conneted to a router and the router to a netgear switch and a windows server 2003 r2 and a Zultis MX Voip sytem.

Suddnetly all connections drop and no Telephone lines or internet connection is available from the LAN
i tried to telnet the cisco router from the outside and i can succesfully log in and ping any website but i get stuck when connecting to the firewall

One of my tools tels me that the zywall is offline and also is noticeable from the actual hardware where the ACT light is off and the network lights appear in orange the zywall have 4 status lights ACT, PWR, SYS, CARD, all are onn and green appart from the ACT light

i tried to send the zywall a weakup on lan packet but still no joy also i tried to switchit on and off and perform a full boot off all system still no luck

Any one have any ideas on how to put the zywall back online? or know this issue
i cant even log in  to it to configure it

HELP!!!!!!
kristianoAsked:
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dpk_walCommented:
From your description, it appears that the box is either dead or the for some reason the configuration has gone corrupt [sometimes a voltage spike might cause this]; I suspect the latter.

What if you power the box down; wait for 1 minute; power the unit back and then check if you can at least console to the unit. You would also know if the firmware has got corrupted; if so, we can reset the unit to factory defaults and reconfigure.

Thank you.
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