First thing I would check is the memory chips installed.
Are they all original Apple?
If not, take all the non-Apple ones out and see if that helps.
Make sure the Mac is off and you grounded yourself by touching a metal part on the power supply before you touch them.
Also make sure the memory chips that are in the mac are fully seated. Sometimes you have to push quite hard to get them to seat in the connector.
Are they all original Apple?
If not, take all the non-Apple ones out and see if that helps.
Make sure the Mac is off and you grounded yourself by touching a metal part on the power supply before you touch them.
Also make sure the memory chips that are in the mac are fully seated. Sometimes you have to push quite hard to get them to seat in the connector.