The presser foot is not adjusting

SOURCE: presser foot lever fell off

You'll need a 2.5 mm hex key metric (you can buy a complete set in Radio Shack for about $10 if you don't have metric). AND you will need to cut down the shorter end of that key about half way (total remaining end will be around 8 mm), as there isn't room for the whole key in that tiny space.

Open the light bulb door, it should be easy to see where it goes but you may need two pairs of hands.

If you take it into a Bernina dealer, they should do it for free as it takes like one minute! Hey...you can ask for nothing! Those guys have all the right tools but there's no mystery, so don't listen to any nonsense.

SOURCE: My presser foot won't snap on to my White 3032

It sounds as though you are missing the ankle which is the part the foot attaches to. The ankle attaches to the metal rod with a screw and the foot snaps onto the ankle.
sewman7

SOURCE: I need a manual for a White 2200 multi- tasker sewing machine.

You need to take this to a repair person.
I do have a manual but you can go to www.whitesewing.com and get one. Also the tension is a big problem if you don't use the exact bobbin. I was told that most bobbins will work in this machine but it turns out that only the one that comes with the machine really works. I would look for the parts to your machine. Sometimes they get lost in your sewing kit.

SOURCE: My serger machine does not do the stiches

Sometimes we think we have the machine threaded correctly, but the stitches just won't knit - I threatened my old serger many times only to find the lower looper thread had popped out.

Open the doors and watch what is happening when you turn the hand wheel.

Make sure the thread antenna is fully extended and thead the machine with the tension open (zero) and in the order shown in the manual.

Once you get this great, but sometimes naughty little machine stitching as it should, do not let it run out of thread.

Cut the thread near the cones and tie off to the new thread.

Open the tensions and slowly run the machine until the new thread appears - you will have to stop as the knot gets to the needles and thread manually.

SOURCE: If the presser foot lever is already lowered and

try turning it off & then back on
I've encountered the problem with my electronic sewng machine
it jams up & I turn it off & then turn it back on, that usually clear the circuit board
if it keeps doing it, I would suggest taking it to be serviced