Resolved Hissing Audio Noise from a 17" MacBookPro 2008

[bobesch]

Sorry, this is not a PPC problem but with regards to the Club 17 I'd like to ask for help in this forum.
A few days ago I got a nice 17" MBP Early 2008. A nice machine - I was happy about it up to the moment I started to listen to music when hissing and whining noise came both from internal speakers and headphones.
Then I booted via FireWire from another MBP in TargetDisk-Mode and there was no noise anymore.
I swapped drives (SSD from that MBP I previously used for booting in TD mode into the MBP with faulty audio) booted from the now internal SSD-drive and the noise was back again.
On the logic board there's the connector for the drive's cable sitting next to the connector for the cable of the I/O-board.
I think, the problem must be related to the drive-connector or drive's cable or the I/O-Board or the connectors/etc on the logic board but I have no idea, how to proceed!?
Swap the I/O-board, swap the drives cable or return the MBP to the seller?
Has anyone else here encountered a similar problem?

 

[AphoticD]

I have witnessed hissing (white noise) in PowerBooks from faulty RAM. Maybe it’s worth running through the Apple hardware test disc?

 

[bobesch]

I have witnessed hissing (white noise) in PowerBooks from faulty RAM. Maybe it’s worth running through the Apple hardware test disc?

Thanks for your help. Yes, I did check RAM by installing both the RAM bricks from my working 17" Book into the faulty one with no success.
Today I could solve the problem: installed the i/o-Board from another otherwise defective unit (which happens to be trapped into a Reset-loop in the middle of the booting process, but now became my backup for display, keyboard-assembly, speakers, fans etc for replacement-parts ...) and the hissing/whining sound was gone.
The seller is a kind person and offered partial refund.
So today I will remember as a sunny, happy & lucky day ...

Quite interesting: that "new" and now refurbished 17" Book sports an antiglare glossy display. Strange. Didn't see that before and nothing to compare to the later/current dressing-tables ...