I have several old, ungrounded outlets in my house which are protected with GFCI, which is allowed per code as the GFCI will protect a person in the event of a ground-fault.
These outlets are supposed to be labeled "No equipment ground" but the previous owner neglected to do this. I assume that if I plug electronic equipment into this outlet there could be problems, but it is not clear what those problems would be.
Is "No equipment ground" a hazard to either people or equipment? What problems could happen if I plugged something like a 3-prong laptop power supply into this outlet? What about a device which uses a 2-prong power cable (no ground) such as some space heater or televisions?