Hi,
if you plain to resell this 2060 card, PM me.
Take all cards out
Just leave the mobo alone without floppy and keyboard connected, but with mouse.
Try to unplug and replug the internal PSU connector, and try to clean every socketed chips and theirs socket with an electrical spray cleaner.
Look under the mobo if you have some track broken.
Then retry to enter in the early.
For me the PSU can be faulty too. Try to read its levels.