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When i tried to reboot i pressed F1 and got the BIOS screen.
It has the drives listed as:

Primary [none]
Slave [wd120gb]
Secondary [cdrom/dvd combo]
secondary slave [cdrom]


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What size is the old drive and new drive? If the newly purchased drive is a 120GB Western Digital HD, it is set to be the slave drive and needs to be reset to master.

You can try simply changing the primary drive in the system BIOS to be wd120gb, but if it is jumped as a slave drive, this will not work.

Look at the back of the hard drive and you will see a small grid of pins next to the wide IDE cable (assuming you're computer is not new). Look for any jumpers that are connecting the pins (jumpers are inserted over two pins and control whether the drive is master, slave, etc.). Verify that they are set to make that drive a slave drive (Western Digitals usually have a sticker on top of the drive that shows jumper settings). If it is indeed set to slave, pull the jumpers out and set them to make the drive master. Restart the computer and enter BIOS to make sure the primary drive is wd120gb.

MisterW