Replacment MB for acer aspire M5100-u5313a AMD

SOURCE: Acer Aspire M5100 AM5100-U5313A AMD 4400 will not

Could be. Sounds like a repair shop issue if no system info is appearing.

This may be pointless, but try it anyway: -

It shows symptoms of RAM error, except it lacks warning beeps or led flash usually associated with this. Some PC's don't have this function.

Remove all RAM and replace one stick only, presuming you have at least 2 sticks. then try the same thing with the other sticks, one module at a time.

It's rare, but RAM does fail and it causes these symptoms. Also, if RAM is mixed and incompatible, this would also occur.

Mixing RAM may also kill the good RAM.

Next, check your PSU voltage readings ie 5v rails and 12 volt rails with a good quality multimeter. Or you might try another PSU.

Really need to have it physically in front of me to give a better answer.