V40 2000 won't start after replacing instrument panel lights

[rubricae]

G'day!

New here, joined the forums after discovering a handy guide for replacing the bulbs behind the instrument panel cluster.

Spent a few hours yesterday taking the necessary panels off under the steering to squeeze out the instrument cluster and replace the blown bulbs as for a long time I haven't been able to see my speed under 60km/h at night, as well as the lights behind the AC controls and some other accessories as a number had blown and never been replaced since new.

Replacing bulbs with LEDs was a success, but after bolting everything back together this morning I was unable to start the engine. The starter turns over but it won't catch. It's definitely not the battery as all peripherals are working fine, though I tried using a battery jump starter initially anyway to no success.

It's fair to say I'm a bit baffled - spent taking off panels again and seeing if I'd dislodged any wires or connectors along the steering column or key barrel but I can't see much evidence of anything out of place, other than a mechanical lever connected to the shiftlock override which was dangling when I opened up the steering covers initially (see pic). It's definitely not the immobilizer as I've got another dummy key with no chip which I tested, which successfully triggers the immobilizer on ignition and won't let the engine turn over, where as the normal programmed key will simply continue turning without starting.


I believe the part hanging down should be secured by a plate or something, but that wasn't there when I opened it in the first place.

A mate brought his bluetooth ODB2 tool over, but for some reason wasn't able to get any information from the ECU - the connection kept dropping and when it didn't it diagnosed 0 faults which is definitely wrong given I had a service 2 weeks ago and the mechanic informed me of a couple he wasn't able to solve related to the electronic systems.

I'm highly doubtful that it's anything in the engine bay that is wrong, as I've changed nothing in the last few days in there... but I could be wrong. I'm not massively knowledgeable in car related matters, so there's likely something I'm missing. Anyone have any ideas?


Model: V40 2000, 2.0L Auto


TLDR;
Changed instrument panel lights to LEDs, now car won't start - turns over but won't catch.