You said you have 44 pounds, but you also said you compressor isn't spinning - it doesn't work that way. The compressor has to be working (spinning) in order for you to determine high and low side pressures.

One way to check if you are low on refrigerant is to turn on the dash switch and then jump the wires at the low-pressure cut off switch. If the compressor clicks on then you have either low pressure or a bad switch.

Good luck,

Greg