This a found on HP site:
HP ProLiant Servers - "i8042prt" Error in Eventlog
One of the following error messages appears in the event log:
Type: Warning Source: i8042prt Event: 32 Description: The keyboard device does not exist or was not detected.
Type: Error Source: i8042prt Event: 26 Description: Exceeded the allowable number of retries (configurable via the registry) on device.
When you hot plug a PS/2-style keyboard (or use a switch box) or detach a USB keyboard, in Microsoft Windows 2000, you recieve one of the error messages listed in the Issue section.
Backup your Registry
Open the key [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\i8042prt\Parameters]
Change the value Headless data to 0x1
Data: 0x1 (Allow Hotplugging) | 0x0 (Hotplugging not allowed)