Thanks for replying. I don't think it's the power supply issue as the drives power up for a while and powers down because the mac doesn't recognise it. I tried using another power adapter same issue.
If the power supply unit u are talking about is in the hard drive itself. Again no issue as my media player unit (AC Ryan) can detect my drives and play the video files in it.
I have been trying to search for tools to diagnose if my USB ports in my mac are stuffed. I am not a techie so am lost.
I have also done a disc verification using disk utility and the result was all good.
Appreciate if you got any more ideas abt this issue.
reset FW bus, same goes for USB reset...
Reset the Firewire bus
If your Firewire or USB isn't recognizing any device. A solution which has worked for some whose hard drive became invisible in 10.4 was simply to follow these four steps to reset the Firewire/USB bus:
1. Shut the machine down.
2. UNPLUG the power lead to the computer and any firewire/USB drive.
3. leave it for 10 minutes.
4. Connect back up and reboot.
Thanks so much for your advice. *2 thumbs up* The mac finally recognised my 1 TB Seagate and is now backing up through time machine.
However it was not recognising my 2 TB Buffalo, when i plugged it in, it kept beeping intermittently. I thought it was disc failure at first (was very upset) but it played fine on my AC Ryan.
Anymore advice you can give?