How do I format the internal HD on an iMac

I tried to install Lion on iMac 2004 (2008)
Now the HD has a problem. I won't unmount via Disk Utility.
The partition with the system shows a circle with a slash through it.
The Mac will boot into other systems on both the internal and external drives.
But the system on the internal is broken. I used the system restor to start up Lion.
There are hundreds of gigabytes missing.
The HD is formatted in 2 partitions. One for Lion, one for Tiger.
I want to get rid of the Tiger partition. Disk Utility tries but can not unmount the Tiger partition.
I think I have to reformat the HD back into 1 partition and instal Lion on that.
It this possible? The Lion partitioin only has 15% free space. I can't just go ahead and use it.
Thanks

Thanks Allan
1. This old iMac had a Tiger install DVD. I don't know why, but it kicks it out now. Maybe it is scratched or now incompatible.
2. I have no 'Snow Leopard' install DVD.
3. I have no 'Lion DVD'
But after I restarted, the partitions unmounted. I erased the sick partition. I downloaded the Lion Combo Update 10.7.3 from Apple. I used Carbon Copy Cloner to clone the old OSX System 10.7 into the clean partition. I updated the 10.7 to 10.7.3 using the new system update DMG I had downloaded from Apple. I erased the old 10.7 partition and merged the now empty partition into the 10.7.3 sysem partition to get maximum space for the new system.
All good to go. I lost some application registrations along the way, but am gathering them back from their respective emails. Some applications no longer work with the message "Power PC applications are no longer supported." Time flies when your having fun. AlephOne still plays the Marathon Infinity games though.
I am very happy to have tools like CCC, SpeedDownload, and Disk Tools that can let a power user on a slow inernet connection do tasks best done by a real technician. I only wish I had the kind of Internet access that Apple seems to think everybody has. I tried many times to update Lion using the App Store. It would sit there for hours 'downloading.' Finally I just used SpeedDownload to get the DMG from the Apple Support site.
Thanks again for your interest in helping others get their Macs working again.

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