Make sure you have the latest BIOS for your MOBO.
Also you may need to change a BIOS setting see the following:
http://support.microsoft.com/kb/929605/en-us
"Chris M" <Chris
> wrote in message
news:59605A0E-60E6-4713-8F9F-...
>I upgraded from 2 GB of Kingston HyperX RAM to 4 GB of matched Kingston
>Value
> RAM. I can boot into XP on my dual boot just fine as well as boot into
> Windows Vista safe mode, but when trying to boot into Vista regularly, I
> have
> had it going for nearly 30 minutes now. The hard drive light is flashing
> and
> the screen is black. With the light flickering it seems to be working, ut
> why on earth would it take so long to boot into Vista and will it ever?
> I'm
> highly confused.