HP Pavilion Issue??

Hi there, I am hoping some of you can help me out. I have a 3.5 year old HP Pavilion dv2000. The problem is when it starts up, (from shut down or hibernate), sometimes I will get an error warning me about the date and time settings. Other times I will get the same error and an additional one saying fixed disk error, then "operating system not found" flashes on the top left of the screen. If I remove the power cord and battery, wait and then reconnect, most times it will fix the disk issue. Sometimes it will take 2 or 3 tries. Regardless, I almost always have to reset the date and time. I may teach it how to fly soon, if you know what I mean. Any suggestions?? :banghead

 

Normally when a machine is loosing it's date and time check the RTC battery, there is a video about
this for the dv2000 here-
LINK

 

http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&cc=us&docname=c00808446&dlc=en&product=1817074
Unfortunately the link I'm posting is not showing?
but if you do a search on google for DV2000 RTC battery you will find an explanation on removing it.

 

http://www.google.co.uk/products?rl...esult_group&ct=image&resnum=3&ved=0CDcQzAMwAg

manual
http://h10032.www1.hp.com/ctg/Manual/c01035657.pdf

AS voodoo3rd says, all typical signs of cmos battery failing