Hi I'm new so I hope that you will bear with me. I have an Emachine 420 had it acouple of years. last week it will not start, after switching on it just makes a jarring noise. Thought it might be the power supply so I changed it no different, thought then it might be a cooling fan, pulled all the power leads no different, thought it might be a drive, took out the Hard dirivwe and set it up as a slave no problems was able to view the files, same thing with the DVD and the CDRW. Left with it must be either the motherboard or the processor. Can anyone suggest a test or something to look for. It runs on Xp the motherboard is a IM845GV and the machine will not start at all no picture no bios nothing apart from a horible noise.