hi hd install help

[webhead]

hello can somebody give me a guide on putting a hd in my 1200 its driving me insane its a standard ide 1.5gb,
on a powerflyer ,its just when i partition it in half,alls fine,but then when i go to install 3.1 i choose hd setup and the thing partitions it too small so when it all restarts workbench has only got i dont know about 8mb,and the rest is work??
its driving me insane ,then if i choose just install it loads everything on to the hd leaves sizes ok but doesnt boot up and i got boot device on hd?so any clues please.
thanks

[webhead]

hi yes i know all that but it installs but it doesnt ask where to put it and when its finished it all goes to the right place but it doesnt boot and yes it is checked ,its very frustrating when you just cant see whats wrong,

i always format the drives aswell and i always see if i can go into the partitions and it does.

so i just cant see a reason for it strange as hell.