I had a similar problem with one of my screens over a year ago after trying to update the software(sent to me from cobahm vis email).  nyway the screen went blank.  Had to send it back to cobham and for a not so small fee they reprogarmmed it.  works fine now.

David
N750DW propjet

>>> jbarrett@carbinge.com 11/30/2012 11:05 AM >>>
The situation:

 

MFD #1 of 2 when turned on goes through the BIOS boot and then returns a
blinking cursor.  Multiple reboots produces the same result (pushing both
knobs at same time for a few seconds).  MFD #2 boots right to Chelton Flight
Systems screen.

 

The scenario and events leading to the situation:

 

I have a Crossbow 500 AHRS that quit giving attitude reference about the
last 15 hours of flight time.  I have two brand new Chelton units that have
never come out of the box.  They are 2006 or 2007 vintage.  I have a brand
new Poinpoint GADAHRS  with MSU and GPS antenna also never out of box and
same  vintage.  

 

My plan has been to replace the Cheltons and install the Poinpoint equipment
at the same time.  I was told that I could swap out the Cheltons but should
first pull off the "limits.txt" file using a smart media card in the #1 PFD.

 

I first removed the Crossbow 500 ( unplugged it) and then remembered to get
that limits file.  Booting up the #1 PFD resulted in the problem in the
first paragragh.  Mutliple tries with the card in or out did not improve the
result.  Then I plugged the Crossbow AHRS back in to see if that would help.
No improvement.  I can't think of another trick to get beyond this and I  am
wondering if any of the steps I did could have brought this on.

 

 

To be very clear, no matter how I boot up (with or without the memory card
and by turning the unit on or by pushing the two knobs) I get the same
result.  Once the BIOS testing is done the screen goes to a blank with a
blinking white cursor on the left side.

 

Any help or advice on how to get the limits.txt file appreciated.  

 

Thanks in advance.

 

Regards,

 

John Barrett, CEO

Leading Edge Composites

PO Box 428

Port Hadlock, WA 98339

 

www.carbinge.com