No post beep!
case speaker connected?
However if it gets to POST screen where drives are detected then motherboard cpu psu memory are ok.
Next it should access operating system from either CD floppy or HDD, depending on how set up in BIOS.
There will be an message to tell you which keys to press to enter "setup" something like del esc F10 etc.
If your HDD is from an old system has it got an op system installed?
If so then the drivers for the old boards will conflict with the new.
no op system then boot from CD or floppy and install windows
old op system boot from CD or floppy and format drive and install new op system.