Hard Drive Installation/Set Up Assistance

I recently purchased a new 80gb hard drive for my old P3 machine. I installed it, but am unsure of the jumpers. I have a cd-rom drive which is the secondary master, but according to the hard drive itself, it says that the jumper is supposed to connect 5/6. When I attempt this, it doesn’t find the hard drive. When I put it on 9/10, it finds it but gives me an error: CMOS checksum error – Defaults loaded.

Any assistance is greatly appreciated. I’ve read all I could find online, but nothing about this… Thanks.