Bobcat S185 won't start

Hi to all this is my first time on a forum but I just can't seem to get any help with one of my bobcats I have had a bobcat s185 since new it's a 2008 model and it has low hours and also has the deluxe panel so what happens is you get in the machine and pull seat bar over then when you go to press the yellow key to put in the PIN number as you let go of the yellow button it just shuts down there's no power you press it again and same thing you will see the bobcat emblem then cuts out if you hold your finger on the button it will stay on and after about 3 seconds you see a small triangle middle left has bd in it but as soon as you let go it all goes dead again I've changed all fuses and put a new battery in also cleaned all the terminals to the battery all I hear is a click noise when pressing the yellow button does anyone have any idea what it may be and just to mention only once when I kept the yellow button pressed on I pressed the 2 ↔️ Keys as well as holding the on switch and I seen some different tests you can carry out so I played around with a few of the buttons and done some test and it showed that all the keys were working start stop etc and after playing around with that when I let go of the button it allowed me to put my pin it and it started but that was it I have tried several times again but nothing sorry for the long post but any help would be appreciated. Thanks again

Bobcat S185 won't start