Although the hard drive can be upgraded, it is not designed to be removed and reinserted on a regular basis. Repeated and frequent removal, for purposes other than to upgrade for greater capacity or problem determination, can cause damage to the system.
Shut down, remove the power cord, and remove the battery from the Value Line notebook before removing the hard drive.
Swap batteries with another similar system, if available. If another similar system is available, then verify that the battery pack works in the other system and that the other system battery pack works in this system.
Verify the battery status indicator. The battery status indicator is normally illuminated whenever the battery is installed and the computer is on, or the AC adapter is connected and the battery is charging. This indicator may be blinking or solid in color depending on the status of the battery.