Bmw 1999 323i has power but no reds on the dash

some amount of detail there!!!... you looking for the miracle faries to help you??...
lights on dash? symbols... when go to red lights (pre ignition) are all lights on?... make life easy on yourself and give more detail.
if lights working on dash and it physically cranks turns over....my first port of call is to pull plug one by one off the spark plugs and check for a spark... I use a screwdriver and shove it up the leed where the plug goes and let it to earth when cranking and you should have a spark at each....if not theres the problem...coil pack... hows that answer for you I hope it gets you started

Certainly sounds like a lack of power in the battery.
Do you have a genuine BMW battery or a cheapie replacement?
Have you tried to jump start the vehicle.
Batteries can seem ok, but when called upon, the power drawn out of them can be insufficient.
Try charging battery and starting on the charger- or just jump start to see what happens

I was facing this problem recently. resolved by jump start.
switch off headlights and everything that consumes battery and then try to start.

Car should start without the airbags ,now under the bonnet somewhere is a fuel cut off switch ,its about an inch square with a red rubber top ,push it in the centre and if it clicks down then car will start

When you say you have power, do you mean the dash lights come on?
The power requirements of the starter motor are a lot higher than that of the dash lights or even the headlights and accessories.

Turn the headlights on and try to start the engine, if the headlights go really dim or right out then your battery doesn't have the capacity that the starter needs to turn the engine over and you need to replace it.

in not the batery and starter the securyty sistem activad is not signal to the stater from ews ii to starter

you have a module problem you need to have your vehicle electronically scann to find them

replace relays and fuses for the power seat and windows.change dash light bulbs.if bulbs are good you got wiring problem check ground wires.

sounds like crank sensor

this sounds like the brake pads may have worn down and the sensors have lit the warning light on the dash, check the brake pads and if the thickness of the pad is at about 3mm then a new set of pads and sensor will be required