I would add before the 'reseat all components' below text, gathered after years of experience in IT department in the coproration. fixes most computer issues and its the first step in solving more complicated computer problems.
Disconnect power cord. Clean the case from dust using vacuum cleaner or compressed air. But be VERY gentle with it.
The some notes:
- if you got no idea how or are hesitating, ask for IT help 
- use googles on the eyes, anit dust mask and make sure there is a good ventilation in the room - you don't wanna have dust in your lungs/eyes and later in the whole room
- clean with all power cords disconnected - you will have better access to the case parts
- do NOT use any liquids - you can make short circuits that will be fatal.If you happen to do that, use the tissues to wipit out, and leave the componets under fan for few hours to dry out (I had a cofee accident at work once )
- do NOT rub heavily the surfaces with electronic parts - you can make the elements to fall apart
- do NOT spray the compressed air on the parts so that the liquid is sprinkling o the surface and vaporizing leaving the white spots - you can freeze to death some parts, and they will break internally.
- when using vacuum cleaner use the brushed end (shoft hairs etc)
- if you do not have such element then you can use painting brush, , play like archeologists or the policemen from CSI 
It's always good idea to make clean once in a quarter, or mount case anti-dust filters.
Hope that helps.
@ Wilmark
Hi, I'd just like to make you aware that I'm of the belief that ingrowing toenails don't require a bone saw, the whole purpose of the thread is to get people with problems to check the obvious before they start condemning a hard drive that may not have anything wrong with it, generally an unseated memory module will stop the pc at the post with bleeps, but sometimes it can be just unseated enough to get through and then cause the whole PC problems, some people may just have a simple case of the comms lead being loose on the drive, that is the aim of the thread to help with all avenue's.
I'm not an employee, I simply help out because I was asked to, nor am I an expert either, I've been around PC's and old gen consoles for a long time and do know a bit about them, and as I've had issue's before I can use this to help other's who find themselves in the same boat, it's also very difficult to diagnose properly from a keyboard thousands of miles away, if I asked you what the noise was coming from my car could you give me an answer first time that would identify it correctly? me myself and the other Seaguru's and non Seaguru's simply try to help other's, so try to bear that in mind before you post up with things like ........does seagate moderate these forums? etc, of course they are moderated, as you can now see for yourself.
p.s, btw, 90% of the HDD fault threads are due to drive shutdown which the 7200:11 series has suffered, if this happens, it never gets past the post page because it then doesn't exist in the eyes of the bios, hence my comment originally, and as for clicking drives, they only ever get one reply from me...send it in, clicking is the death throes starting imo.
