Ok so recently ive attempted my first build, these are the specs. ASRock P45DE Mobo Intel Pentium Dual Core E6500 2.93Ghz 2x 1GB Kingston HyperX DDR2 1066 RAM Nvidia GeForce 6200 Western Digital 80GB IDE HDD 420W PSU I thought i had succesfully build my computer because i had it down stairs fully running, just installed Windows XP Home, was downloading updates from update.microsoft.com and getting drivers for graphics, once i was done i installed the driver for my wireless USB adapter, now came the first problem, when i would insert a USB device in to my front left USB port for some reason my computer would turn itself off, i couldnt figure that one out so i just didnt use the front left port. After that i moved it upstairs, plugged it all in properly, and then the computer would just not turn on, so my next move was to take everything apart again and rebuild it, which i did, but would still not turn on, at this point i thought maybe the system panel header could have maybe been the problem because i did have doubts i had done it correctly because i didnt quite understand what is positive and negative and just followed some advice from the internet saying just make sure the words on the connectors are facing up. I noticed i had made a mistake of putting the reset switch and power switch connectors in each others place, so i fixed that, but still the computer did not turn on, at this point i was getting quite frustrated so i decided to check the other end of the wires in the front panel, so i undid a screw holding the plastic case that covers the wires and unclipped it some places but then saw there was one clip that i didnt have the means of un-clipping stopping me from removing it entirely so i gave up and put the screw back in and this si the funny part, as i was pressing the clips back in my computer turned on, now i thought everything was ok turned it off, went to bad and today i came in here o turn it on and now is not working again, i tried fiddling with the wires in the front again but to no effect and am completely mind boggled.. any help would be really appreciated. Thx.