Heating and air no power

I have a 92 astro vortec. Have been having problems with intermittent high blower front and rear. Now I have no blower at all. The A/C was working great untill this morning. Now the compressor wont kick on and no fan at all. I tried jumping the low pressure switch and still no compressor. Any body have any ideas? Was going to start from the batt and work till no power but if someone has an idea I would appreciate it.