thanks sa lahat ng replies, i had my sister do the starting while i was observing the engine, i saw this line connected from the condenser to the compressor vibrating badly. so binalik ko sa shop tas tinuro ko sa kanila, they made some adjustments tas nawala. hinigpitan lang daw nila tas medyo bawas ng freon kasi napasobra daw. weird di po ba? kung maluwag yun eh di sana nagleak na lahat ng freon ko. anyway nasolve naman so that's a relief!