We will replace the bad components on the current PCB (printed circuit
board) or replace the whole PCB.
it is a Must Doc or Die to keep the original old ROM BIOS chip from the old board and plug it into the new replacement PCB.
We MUST transfer the original factory ROM BIOS
chip from the old PCB and plug it in or solder it onto the new replacement
PCB. Your drive cannot run without the Original Factory-ROM
BIOS chip
from the OLD BOARD!!! Every ROM BIOS chip is configured to
compensate for that particular drive's read/write heads microscopic mis-alignments,
which every drive has. The HDD and the ROM BIOS chip are ONE. 
