Last night I noticed the stereo was not illuminated and would not turn on. Today the car is completely dead, no power locks, no clicks on ignition. original stereo (not aftermarket) and this is first electrical problem since owned car. Suggestions on finding problem?

check battery cables one is loose

Most likely, the problem you are dealing with is a dead battery. The reason this is apparent is you said "there is no clicking noise like a bad starter, it just does nothing..." Normally, if there is any charge at all in the battery, you will get the clicking noise you describe as the ignition circuit is trying to charge the solenoid that turns over the starter and turns on the engine. If you have a battery jumper box available, your S40 will probably start at the first flick of you ignition key if your battery is fairly new. To hook up the battery box, just place the clips as you would standard jumper cables, red to red (+) on the battery and black (-) to a good ground point on the engine (it has to be solid metal-to-metal contact). Then turn key to fire up the engine. Once your car has started you have to run it about 10 miles to put any sort of charge back into the battery. If the battery won't hold the charge then it is time to replace it.

Saw this once before..Could not believe it but it was the battery. Crazy thing happen when the battery is low.

hi jerome
I have the procedure for Toyota auto lock, is worth to try it
AUTOMATIC LOCK SETTING
1) Step in the vehicle and make sure that all doors are closed completely
2) Insert the key into the ignition key cylinder.
3) Wait for more than 5 seconds.
4) After turning the key to the ACC position, turn the key from the ACC to the
ON position 5 times within 10 seconds (Last position : ON).
? Status Monitor LED will illuminate for 30 seconds.
Note : In case you implement 6 times or more by mistake,
action steps 6)-8) you made will be canceled.
Please retry from step 2).
5) While the LED is illuminated :
• Open and close the driver's door 2 times.
• Turn the key to the ACC position.
? LED will continue illuminating.
? Indicator lights will flash 2 times.
Ignition controlled door lock ON :
6) While the LED is illuminated:
• Open and close the driver's door 1 time.
• Turn the key ACC-ON-ACC 1 time (Last position : ACC).
? Indicator lights will flash 1 time.
? LED will extinguish.
Ignition controlled door lock OFF :
6) While the LED is illuminated :
• Open and close the driver's door 2 times.
• Turn the key ACC-ON-ACC 1 time (Last position : ACC).
? Indicator lights will flash 2 times.
? LED will extinguish.

at risk of being smart ***, try moving steering wheel. maybe it's turned too far in one direction,and that it's 'locked'.

could be a problem inside the alternator
you might want to have it bench tested at a store

this car needs tested by an autoelectrican to check voltage/or did you just leave a door open/tailgate this in turn leaves a light on and run the battery flat.adrian;;;;

check battery and connections first starting requires 300 plus amps lights about 50 so lights work but not enough to start try jump and if starts take to parts store and have then test battery

Check your Emergency light switch and turn signal switch.

It must have been weather related. When it warmed up, the key worked and the steering column unlocked.