***** Happy New Year to all. *****
I have now a simple external case to run hard drives on a USB 2 connection. I also have now a SATA Western Digital Scorpio Blue hard drive - WD3200BEVT as recommended above as being properly compatible. (Larger at 320GB only because it happened tobe easily available - is size of drive an issue?)
Results, using disc utility, of various combinations as follows:
The original hard drive is not recognised in the external caddy.
The Western Digital WD1600BUVT is not recognised as an internal drive but is recognised in the external caddy. I was thus able to partition it as GUID as recommended but this still did not enable it to be recognised when installed internally.
The new Western Digital Scorpio Blue hard drive - WD3200BEVT was not recognised when connected either internally or externally so I could not try anything with it.
However, here's a puzzle: using a borrowed slightly newer intel macbook (macbook 5.2 serial no.149260224R1 running on OSX 10.5.6) I have partitioned this disk using the USB external caddy, although this has still not enabled my computer to recognise it.
(The borrowed computer also does not recognise my original hard drive in the external caddy)
I am still able to use my computer, apparently normally, without an internal hard drive and running from an old IDE drive (40GB Toshiba MK4025GAS) in an external USB 2 caddy with OSX 10.4.11 installed on it.
So it looks as though I have two problems - the original hard drive is damaged; and the ability of the inbuilt hardware and/or software to recognise anything in the internal drive slot is damaged.
Where to now?
A point of advice on the forum etiquette please: since I began this thread with an erroneous title is it acceptable to repost as a reference to this discussion with a sensible title to attract the attention of appropriate experts or is that inappropriate or unnecessary any way?