arduino and pc

can i use arduino to start the pc and run processing sketch file after that???

can i use arduino to start the pc

Sure. Connect a servo to the Arduino. Position it so that when the Arduino rotates the servo, it presses the on button.

and run processing sketch file after that???

No. The Arduino can not start a process on the PC.

eng_house:
can i use arduino to start the pc and run processing sketch file after that???

Sure, you only need to short the two power wires to start the computer up, and then just put a processing sketch thats been exported (or a shortcut to said program) in the the startup folder and it will auto run.

P.S I don't recommend messing around with your computer unless you know what you are doing..