i have a problem with my hard disk, can anybody help?

I deleted two different partitions on my desktop hard disk but did not format or created a new partition from the un-partition space before shutting down.
I later tried to start up the system but it refused to boot; it only displays the first start-up screen and it won’t go any further nor will it enter into setup. I detached my hard disk from the motherboard and restarted the system, it enter setup since that’s all i could do without a hard disk connected. I keep getting stuck with the startup screen whenever i reconnect the hard disk….
I really need to get this fixed… Anybody with an idea of what can be done to fix it should reply or get in touch at yinkay3k@yahoo.com
thanks