I really need some advice here - please!
Have a Seagate Barracuda XT 4000DX000
It died suddenly and was not showing up in Windows or MB BIOS.
The drive would spin up, no other noises and just keep spinning.
Weird thing was when you powered it down, it seemed to spin a lot longer than usual until it stopped.
So I got a donor drive, swopped the PCB and BIOS chip. Exactly the same issue.
Next I swopped the heads and now it spins up, the heads move across the platters, no damage on platters or heads but makes unusual noises and then stops spinning.
Please see video below. Gets interesting mid way through.
The wind noise is the laminar air flow filter sound but you can clearly hear the odd sounds.
Its not really the typical beeping sound, its also not grinding, its kind of a singing drive?
I don't have a PC-3000 to do any fancy diagnostics.
I hope someone can offer some advice! Please!!