If it is a good PC that you like, and you have a good PC builder/repairer locally, it might be worth having it checked out to see if it's just the PSU.
My needs are very basic and I've never bought a particularly expensive PC, so I'm currently using an Acer with a 2.5GHz processor, 3GB of RAM and running Windows 7 64-bit; cost was just over £300.
It is my understanding that Mesh went into administration but, even before that, they did seem to have serious "customer complaint" issues that weren't being satisfactorily resolved.
I've heard of Zoostorm and haven't come across any adverse comments, but that's all.
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Mike