My system is presently built into a flat desktop case which will only take a power supply which is less than 135mm deep, which restricts the power supply to below 300 watts. A normal ATX power supply measures 150mm deep. I do prefer this type of desktop case as it is less clumsy, and easy to work with, but I would like to increase the power supply. I did modify a similar case, by fitting an extra base on it to allow a normal ATX power supply to be fitted, but for some reason normal ATX power supplies of greater power do not appear to work with the case. It could be something to do with the wiring on the case. I have searched for a similar type case, which actually takes a normal ATX power supply, by searching the internet, and, although I have found numerous such cases on United States websites, I cannot find any british company who sell such cases. Any help on this subject would be greatly appreciated.