I got tiger install discs for my emac but I cant get it to run the install. I tried putting the disc in and clicking the restart button on the screen that says "Welcome to Mac OS X 10.4 Tiger", but when I click it it just restarts my computer and does nothing. I then tried the alternate install it did the same thing it did nothing but restarted my eMac. I then tried restarting my computer while holding c key nothing once again. Then I tried holding down apple, option, f , and o keys and then typed in cd boot and also tried cdrom boot nether of them worked so i restarted and tried dvd boot/dvdrom boot nothing worked on all the occasion i got a grey screen with a circle with a line through it. What do I need to do to get these install discs to work?