Well my xps 8940 is dead. Selling it off for parts. DELL won't  honor the warranty because I opened the case and installed a second  fan. It was only 4 months old. I will  never buy another DELL computer. Trying to deal with their India tech support with people who can barely speak English and cannot be understood because of their thick accent  is not for me.
After opening the PC to install a second case fan and a new CPU cooler it will not turn on. When I push the power button nothing happens. I have tried disconnecting the power cord, holding the power button down for 15 seconds and after reconnecting power cord still nothing. I noticed that when I reconnect the power cord the light on the back of the power supply comes on green for a couple seconds then goes off. The computer is completely dead. No fans turning, no light on the power button. Does anyone know how I can troubleshoot this? I have removed the second case fan and the CPU cooler and replaced it with the factory one but that did not help. I would appreciate any help. Dell tech support will not help me because when I opened the case and installed the fans they say it voided my warranty.
XPS 8940, will not power on, added CPU cooler, fan