I am having a problem with my Mesh Matrix A2800+ which I purchased in 2003. When I switched it on there was an error reported with CMOS before it booted up, therefore I have replaced the lithium backup battery and reset the time and date. However I am getting a voice message when I switch on saying “computer now booting from operating system”, what else should I be doing to correct this, or is iit time to get in the professionals?