[tessie]

Hi
Been having some problems with the above recently. The car is currently at rest in the garage until I get time (and/or money!) to do or get done some repairs to get her back on the road. So she's been off the road for maybe eighteen months but fairly regularly started, run up to temp for a while and moved around and this has all been fine. However just very recently the immobiliser seems to have been coming into effect most, but not all, of the time and she can't be started. Currently I cannot get her started. Tried the battery disconnect approach and this hasn't worked. The circumstances are that I get in, put key in ignition, turn the key to the point before activating the starter (at which point the dash lights up as it should), then turn key to start and the whole system goes dead, with no effort to turn the starter, not a cheep. The only way to get back to life is to disconnect and reconnect the battery but then the exact same scenario happens again.
Any ideas anyone? It's the Volvo Guard system.
Cheers