I have a compaq presario 7110US with 2 gigs of ram. I installed a Seagate Ultra ata 100 160 gig hard drive. The hard drive will be used as the primary drive. No other drive will be installed with it. When I installed the drive , my computer is not recognizing the drive at all. When I turn on the computer, the system just shows COMPAQ on the screen and in the top right corner an arrow just blinks. On the top left hand corner, it shows 2048MbOKay. When I attempt to put the seagate disk in the cd rom, it doesn't do anything. I do not know what else to do???