LaCie USB 160GB HDD won't mount, just beeps

Purchased a new 160gb LaCie external USB HDD, but can't get the mac to recognise it. I have tried it with and without the additional USB power lead, but nothing happens. The HDD just constantly beeps.
Not sure what to do. We have tested it on other macs (laptops & desktops) and it mounts straight away no problems. The USB ports work for other things fine.
Any suggestions would be appreciated.
Thanks

Welcome to the Apple discussions.
Powerbooks often don't put out enough juice on the USB port to power external hard drives. The external drive may not start up or may start but still not be recognized by the system. One solution is to get a power adapter, as Hardy recommended, or, if possible, to use a Firewire connection (Firewire doesn't have the power issue USB has). There's also an advantage to using a Firewire connection, in that Powerbooks can only boot from a Firewire device. So, a USB only hard drive, once it starts up, is fine for backup but cannot be used to boot the system, if needed. Lacie sells a power adapter for around AU$25.

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nonononon...
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mrfredmor_65 wrote:
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