I have a Janome 6260. My machine sewed great, but this time when I went to use it the knob on the side of the machine that makes the needle go up and down suddenly got really hard to turn and then when sewing the machine makes a funny noise, and then the needle gets stuck in the down position and will not come back up and the machine stops sewing and an I get a Lo on the screen of the sewing machine. I tried turning the knob to see if I could loosen it a little, I turned the machine off to see if it would reset and nothing has helped..

Hi , i have had the same problem and the solution above is not the problem. Did you ever find out what the problem was and how to fix it.

I've had the Lo come on my screen of my sewing machine also, but normally when I turned it off it corrected the jam up.
Lo- A button is pressed when the machine halts due to a overload
wait 15 seconds to recover
if thread jamming causes the overload, remove the tangled thread
check the bobbin area for lint & loose threads
also check to see if the bobbin is warped
check you needle to see if it's bent-roll on a flat surface to see if it rolls correctly
if it's blunt it makes a popping sound when going thru fabric
let me know if these suggestions help