Terry, thanks. I did mean 'replacing the RTC battery', not the clock. 
The irisvista site has instructions for 5105 - an almost identical model 
- and I intend to work on it soon.  Thanks again.
Ashok

tc wrote:
> Did you try replacing the BIOS battery. This could be the problem. IrisVista 
> has some disassembly photos which might assist you.
>  http://www.irisvista.com/tech/
> 
> Terry
> 
> "Ashok Meghani" <ashokmeghani@gmail.com> wrote in message 
> news:FJmdnbeqgoMXWPnbnZ2dnUVZ_r-onZ2d@comcast.com...
>> Getting the msg 'RTC failure', computer keeps rebooting. Can anyone point 
>> me to a hardware guide for replacing this computer's real time clock? 
>> Thanks. 
> 
>