Hello Vernon, and thank you for using this service.
Sorry to hear about your trouble with the Toshiba. You listed some repairs/replacements on the unit, but it's best to start from the actual symptoms you are having now. How often does the unit not turn on, and when it does that, how do you get it to turn on?
How often does the unit not turn on, and when it does that, how do you get it to turn on?
Actually, if the unit is not turning on, or turning off unexpectedly, that's usually due to a power supply issue. That's why I was asking about how often that particular problems occurs.
Since you do not have the computer you are asking about , I will opt your question out to other experts for review.
Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
If two motherboards are experiencing the same issue.. And if we give the PC tech company the benefit of the doubt that they did install the new board, and installed it correctly.
Then in my mind that points to this being a bios issue. What version of bios are you running? Is it the newest version of the bios applicable to that motherboard?
If you dont want to continue, let me know so I can send you the refund link.
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.