Operating System Doesn,t Run

First of all, is the BIOS correctly identifying the harddisk you just installed? If not, that needs to be corrected. Once you are sure that the drive is being recognized, make sure that you re-enable the RECONFIGURATION BIT in the BIOS (under the PnP section), then re-boot the system. If the drive that still works (did not crash) contains Windows 2000, you probably will need to re-install Windows 2000 on the system. Since Windows 2000 is very hardware specific, any difference in hardware (NIC, video adapter, motherboard, etc.) could prevent the system from starting. Once the Windows 2000 is re-installed, the system should run properly. Good luck.

Run a scandisk for bad sectors on the drive while you have it in the other system.
Install the drive in the other system and insert startup disk,boot sys and if system starts up,select the choice to run setup with out cd-rom support
Check the ribbon cable to make sure that it is set on mb and back of drive properly,you may want to replace it
now check that memory modules are seated correctly
The video card needs to be checked also place in other system and see if it works

Sounds like power, Memory, or BIOS problem, Hard disk works in one system and not the other. Start base line trouble shooting memory, video, ribbon cable, and try bootable floppy.

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