If all lights of symbols come on and stay on even while driving

Do any light's light on the instrument cluster when this happens ? Check engine , wrench symbol light ? Could be a problem with the ETC - electronic throttle control . Have you had anyone check it out ?

Have codes scanned and see what they show. May be a cat clogging up or chemically dead as well as an O2 sensor giving false readings.

Depends if you have charging ports or just standard USB ports. If any of them have a little lighting bolt symbol or some other kind of arrow or power symbol that usually means it's a charging port and stays live even when the computer is off.

The light is telling you to get the computer checked for trouble codes.
The codes can be for performance or emission problems, or both.

Which light is staying on constantly??

If it is the Hard Drive light - it could be because you plugged the cable to the hard drive in the wrong way around.

You will need to be more specific though.

What colour is the light? where is the light? any symbol next to the light? When does it stay on? etc

which indicator? A warning light on the cluster? Symbol?

Items to check:
Try wiring behind alternator.may be full of corrosion.
One of the accessories maybe shorting out and draining battery.
(Techns know how to find this out)

thats the heater coil symbol for the diesel engines.
does it stay solid at beginning as normal?
if the car drives normal, then maybe its just a loose connection/wire somewhere

Check at the headlight sockets for a bad ground.

This is usually caused by the switches sticking in the door latches. Try spraying some WD40 in the latches and open and close the doors a bunch of times that should take care of it.