All hardware drivers re-installed  Including two Hybrid Tuners. Now need to soak-test to ensure that there weren't any other issues in addition to the PSU failing (hopefully nothing powered by the PSU was the cause of it failing).

Giving the following upgrades some thought:

RAM: 1GB was installed straight from the factory from what I'm able to recall (2 x 512MB DDR2 Sodimm's). Up to 3GB can be installed in the form of 1 x 1Gb DDR2 Sodimm and 1 x 2Gb DDR2 Sodimm (understand that 4GB is not recognised by the BIOS even with the most current version of firmware installed)

CPU: A 1.66GHz T5500 Socket-M was installed straight from the factory - The largest CPU that works from what has been understood from AVForums is a T7600 (just remember that the Motherboard only accepts 667MHz CPUs). T7200 CPU's work well with these machines also by all accounts.

DVD: A Panasonic / Matsushita UJ-845-B is fitted as standard. It'd be great to replace this with a Blu-Ray Drive however this will need to be a slot loading version (PATA as opposed to SATA).

GPU: Not upgradeable on a 500 as the Motherboard doesn't have an MXM-II Slot however there have been various achievements with GPU upgrades on AVForums and upgrading to a 9500mGS for example sounds feasable.

Hard Disk: A 250GB Sata-II was originally installed (quite noisy) - Up to a 2TB Sata-II can be fitted from what's understood however an SSD is something I'm under the impression is more appealing. Less power consumption and no noise at all.

Think that's all. Hope this PSU works okay. Several of these have failed since buying from eBuyer originally.