HEY GUYS, I RECENTLY BOUT A IBOOK G4 AT A YARDSALE. THE LADY HAD TOLD ME THERE WAS NO USERNAME OR PASSWORD, SO I BELIEVED HER. AS SOON AS I GET HOME I FIRE UP THE COMPUTER. IT ASKS ME FOR A LOGIN. I HAVE NO CLUE WHAT TO DO WHEN IT COMES TO MACS. ALL I KNOW IT THAT ITS RUNNING LINUX, AND IT BOOTMANAGER YABOOT. I TRIED A MILLION THINGS BUT NOTHING SEEMS TO HELP. ANY HELP IS APPRECIATED! THANKS!