Since SFF is proprietary its better to get working unit. XE2 with windows 10 is the way I go now. [URL]  
I have a Dell Optiplex 7020 SFF which is failing to turn on. When I turned it on yesterday, the power light turned on and it was making a continuous beeping sound but no power on Keyboard and the monitor was blank. I read on the internet and opened up and cleaned the 4 RAM modules. But after restarting the PC, the beeping stopped but the power button light is on but the computer does not turn on. Have tried to replace the CMOS battery but it didn't make a difference.  Any suggestions please to solve the issue.
Optiplex 7020 SFF not turning on