That's a custom/proprietary PSU (possibly OEM is Delta from the label layout), and a standard off-the-shelf ATX PSU will not fit at all. I would suggest dumping the rig, then get new motherboard, new casing and your desired PSU. You can move the processor, RAM, HDD and CD/DVD drive to the new machine...

This post has been edited by lex: Nov 19 2013, 05:13 PM

Do you realize that this proprietary PSU only has 12V outputs (including the standby power)? Can see that from the ratings on the label. I don't think any amount of simple rewiring and soldering may get any off-the-shelf standard ATX PSU to work on your machine (can compare the power supply connections and you will see they are vastly different, including the standby power side). If you want to get a off-the-shelf standard ATX PSU to directly replace that proprietary PSU then some electronics knowledge is required (in other words more complex modifications, especially that standby power section). You could use off-the-shelf standard ATX PSU as a secondary PSU though (using a relay to activate power on/off control), though that PSU will be dangling outside the casing. Depending on the PSU design, some may require a minimum load to get the PSU kept switched on as well. The common ground on both PSUs also has to connected.