You're welcome.  Not sure what you mean by "midi."  So here's the Optiplex sizes for the 9020 pictured.  Use the size in your search term for an MB.  For example, "Optiplex 9020 MT motherboard," or "mini tower" is fine too.  Besides eBay, sometimes I use Google.  Then it shows me some of what's available from eBay, newegg, Amazon, etc. [IMAGE]  
Hi,  Optiplex 9020 i7 32gb ram (upgraded) win 10.  From a turned off position it doesn’t start when i press the power button, no lights. After I play with the cmos battery, remove and wait and place it back, and then it may start. I am thinking if this could be the BIOS settings, cause I had changed them. Sometimes it will give me the 1 and 2 blinks of amber light as a MB problem, but when i start the windows there are no issues.Could this be the changes from UFIA to Legacy mode in the BIOS. Thinking of preinstalling the windows but configuring the BIOS properly before that. Any clues what could be the issue here?   
Optiplex 9020 start problems