Hard drive woes

Went to boot up the laptop last night.......it was on the blue screen of death.......rebooted.....2 beeps......reboot again......2 more beeps.......can't locate hard disk........ARGH!!! Put in another hard drive, boots right up. Put the old one back in.....NADDA! So I've lost everything on that drive. Pics, patterns, embroidery designs, bookmarks....everything! The worst part is that I can't remember everything that was on there. :( So today will be spent trying to recreate it and reinstall stuff. Lots of fun I tell ya, lots of fun!