I HAVE A PRESARIO 1220 LAPTOP 200MHZ CYRIX W/MMX NEOMAGIC VIDEO TOSHIBA 2.6GIG 60MEG RAM WIN98 2NDEDITION FRESH FORMAT AND DRIVERSALL BOARD VOLTAGES SHOW GOOD CPU HAS A TEMP HEATSINK WITH FAN DURING THIS REPAIR HARD DRIVE WORKED FINE IN MY TOWER WITH NO ERRORS FOR A DAY REMOVED EXTRA RAM CHIP MODEM CDROM FLOPPY KEYBOARD MOUSE AND USED EXTERNAL MONITOR SYSTEM HAD THE SAME PROBLEM BEFORE FORMAT AND AFTER LOCKS UP WHEN YOU OPEN MY COMPUTER AND TRY TO OPEN C DRIVE OPEN ANOTHER FOLDER AND IT LOCKS NOT ALLWAYS AT THE SAME STEP BUT WITH IN 3 OR FOUR FOLDERS ALSO USING THE NET CHANGE SITE 2 OR 3 TIMES AND SYS LOCKS HARD ONLY COLD BOOT RESTORES IT THE ONLY WAY IT WONT LOCK IS WHEN YOU FORCE IT TO RUN IN SAFE MODE THEN I CANT MAKE IT LOCK UP AT ALL SAME PROB ON AC OR ON THE BATTERY ANY ADVICE OR IDEAS ANYONE HAS WOOULD BE WONDERFUL AS I AM STUMPED THANKS RUSS