Would my 2000 Nissan Altima lose power that quickly? The car seemed fine when I parked it last night. No sign of anything wrong. I woke up this morning and it has NO power at all. There is no clicking sound when you try to start the car, No lights nothing at all is working. What should I do first?

I would think not.

Fuel filter air cleaner filter plugged or need a tune up or air sensor in intake line put on computer will tell you right away if you want

Easy fixes would be to check and clean relays and fuses, check the battery cables, and the grounding cable. Might be the starter solenoid also.

Grounding cable usually goes from the starter to the chassis, or from the engine to the chassis.

The cable might seem okay on top, but can be corroded (if it's copper, it's most likely oxidized through and can't get a contact.)

Classic engine miss. The cause might be a faulty injector, or more likely an issue with ignition. Start it at night in the dark and look for arcing- that is the area to start. Plug wires and ignition components.

hand it over to a mechanic or Nissan. If you recently had an M.O.T and it went of quickly then ask for a refund, even better, ask him to take a look at the car again

it's your cluster go get it fixed before it starts doing major damaged

check your driveshaft from the trans to wheel (both L and R). Possibly it popped out or is disconnected.

try switching the car on not running so the fuel pump work and see if you can find leak,,if no luck crank it and look,, good luck

Usually - black smoke is unburned gas..
Could be bad gas..
Could be an intake issue causing wrong mixture of gas & air..
Try using a higher octain..

replace the front oil seal. first i would clean the engine with purple power (degrease etc.) then look at the engine and make sure the leak is not coming from above like possibly the valve cover gasket or from the oil sending unit. try to tighten the bolts on the valve cover and even the oil pan. you never know, you may get lucky. i don't know where you are but front seals are cheap but the labor on the job is what costs you.