Other XC90 Problem: Help! XC90 2.4d won't start and won't communicate with ecu

[ArtMart]

Hi, my XC90 (2004 model 2.4 turbo diesel) gearbox has developed hard shift problem, so I have read on line and on most forums it pointed to solenoids as the culprit and that they can be cleaned, so I rolled up my sleeves yesterday and got to work. Good few ours later all was done and I was about to test if it has worked, went to start the car and nothing... lights came on the dash but starter did not kick in (I know my battery was week) so I jumped it to my van and still nothing. It turns out that when I was re-connecting earth cable to subframe & gearbox mount I just had it finger tight and forgot to proper tighten, so mistake rectified, went back to start the car and this time starter worked and it started... but it only ran for like to 2 or 3 seconds and then just dies (like what my VW does if immobilizer is not working), tried again, the same again, it was like this for 3 or 4 tries and now it just turns over put won't fire up no message re immobilizer etc on the dash. I connected my ebay Delphi obd scanner and now it doesn't communicated with any of the system modules, like engine, ABS/brake, imobilizer, AirBag, i just get a message the control is not responding, but i can connect to instruments and multifunction modules? prior to this i was able to conncet to all. I am at a total loss as to why this has happened as prior this the car started on the button and as i said i was able to scann all modules for error codes. I have checked all the fuses and can't find a single one that is blown. Now, when I put ignition on, I also get a message that my brakes have failed, SRS service required etc... also i have noticed that next gears indicators are not illuminating? Any one any ideas please?????