Have been trying to upgrade the ram in a powerbook Pismo. Top ram slot was easy, bottom one was a problem. I followed the instructions and removed the daughter board and put in a ram stick. Put it all back together but it was dead. Switched back the original ram and now it is still dead. Can hear the hard drive spinning but screen is blank. Have retraced my steps and the daughter board has snapped back into place but....nothing. Not sure what to do. Any tips?