Uhm.. PCVRX650 is a desktop, not a laptop.
The PSU may be standard and it may not be. If the mobo is standard ATX, then the PSU probably conforms to some standard too. Look at the PSU - there should be some brand-type info on it. Google and try to figure out the form factor.
And even if it was a laptop, any PSU with suitable voltage/amperage and a fitting plug will work just fine. I have mixed and matched Dell, Hp, Fujitsu, IBM laptop PSUs with absolutely no problems. That is if by "PSU" you mean the separate adapter. The power circuitry inside the laptop is not the PSU really, but just some auxiliary bits on the motherboard itself.