How should I fix my old Dimension 4300?

I went down into my basement and saw my old Dell Dimension 4300 gathering dust on a shelf. I figured that it could be pretty fun to fix it up but cannot find the problem. My computer will not boot instead it displays the message "Primary hard disk drive 1 not found."

I checked all of the cables and actually dusted all components in the computer. I do not have a boot disk. When I try to run the PC in safe mode a blue screen flashes for a small instant. The diagnostic lights display only D as yellow indicating a problem of "other."

I would like to avoid calling Dell because last time I did they said unplug your hard drive and my graphics card caught on fire.

Any help is greatly appreciated.