Random House. 89. ISBN 0-375-50524-5. ^ Michael Krantz (June 24, 2001). «Beyond Doom and Quake». Time. See Figure 14. 5. Remove the 4 screws securing the bottom support piece to the game and remove the bottom piece. If necessary, remove the nut and screw securing the meter bracket and remove the bracket in order to access the screws. See Figure 11. NOTE: Be sure to use the same 6 screws that were originally removed from the CPU section. This will start the hard drive checksum test, which should take about 20 minutes to complete. 4. When the hard drive passes the test it will display a «CHECKSUM GOOD» message and continue to boot up into the game attract screens.