I'm not familiar with this particular machine, but I used to have a similar 286 based machine. A noname tawianese brand, model HL3200 or some such. Designed to look like the Toshiba 3100, but with EGA and an MFM HDD. The main problem with replacing the power supply with one from a generic PC is that the original supply probably had a high voltage output to drive the plasma display. In my 286 machine it was 205V. If you use a power supply that doesn't have the 205V line you'll be able use an external monitor, but not the plasma display. Which would kind of defeat the purpose of getting it running these days. Your best bet would be find a power supply from another machine. One from a 286 based T3200 might do, as may one another machine with a plasma display if you can work out what goes where. It probably won't fit in space where the original power supply was. Either way I'd retrieve the original power supply from the garbage to work out what goes where. I had mine many years ago. I found it in a dumpster with a cracked screen and no drives. This was when back when a 286 with EGA was something special, at least to a 13 year old with no money. I got it running on an external monitor and dumped the broken plasma display. It lived out the rest its days in a plastic case that once held an apple 2 clone, a naked 5.25" FDD and a 30MB MFM HDD at it's side. I completed Leisure Suit Larry 1, Duke Nukem 1, Catacombs 3D and others on this beast before upgrading to a Wang 386-16 (a full size case with room for 2 70MB MFM HDDs with noisy bearings!) and a flaky VGA monitor with serious screen burn. A good used VGA monitor cost around AU$200 at the time so I has to settle for one removed from an old memorex terminal, but I could finally play Wolf 3D.