narakputra

hi every one
i use a hp pavilion laptop with 2 gb ram and centrino1.73ghz c2d vista ultimate 64bit.
most of the times when i press power button(when my laptop is switch off or say shut down)the very "first screen" which shows hp logo,intel logo and phoenix logo along with press del and press f..... options remains for too long and i mean too long i.e. nearly 160 seconds.
but this problem occurs 8 outta 10 times.
and whenever this problem occurs , cd rom icon from "my computer" window disappears and thus i cant use my cd/dvd rom.
bt when on switching on the "first screen" shows for a fraction of a second then everything works fine and cd/dvd rom appears in "my computer" window.
i thought that there might be some problem in my hdd so i did a factory reset(i.e. recovery) bt to my disappointment nothing went right.
the problem exists as it happened to be.
it is very irritating to sit in front of a black screen and do nothing for almost 4 minutes.
is there a solution to my problem?
so can i get help from someone?
plz help me im really p***** with this problem.


thanks in advance