MacBook (13-inch, Late 2009) black screen and reset smc

My new macbook will not start occasionally, there is a black screen after the boot sound and screen with apple and wheel, in black screen i can hear the sounds changing the volume level, but the only way to work is forcing the shutdown and restart until the mac start normal.
I also wanted to ask how reset the SMC whith new mac book (i can't remove battery) there are not articles on the support site.
Sorry for the language but not speak English very well

Message was edited by: sara1982