Dear Sylvia,
Thanks for your analysis, presently the laptop is with HP only to replace the hard disk, earlier they checked the motherboard self check diagnosis and it gives a positive report that the motherboard is working as per specifications. I didn't know the root cause of the problem and guide me how to resolve, if you feel motherboard is the culprit then how to identify/justify ??
when hp is saying that is working as per specification.
Thanks & Regards
A.Chellappan