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Hi there AJ and welcome
If you remove the ram, does the Lenovo then start up?
What size is the Ram and the exact specifications of it?
ok, and this is in addition to the memory in the Laptop already correct?
ok, so you only have a total of 16GB right now correct? As if you exceed 16GB it will not work.
ok... sorry AJ, but please review my last question as you said No to it.
You only have a total now of 16GB correct?
thanks AJ, needed to confirm.
Put one of the 8GB in and a 4GB
Does it then start?
ok, now try the other 8GB please and see if it starts with that and the 4GB
which version of windows do you have?
ok, with the 4+8 ram in it, follow these instructions and tell me how much Ram its showing
ok, put the 2 8;s in again, still wont start?
just put one 8gb in, does it start?
ok, and now try the other please
ok, to me it points to faulty RAM when they are used at the same time. Its not exceeding the value and we know they work with the 4GB but not by themselves or together AJ. A fault with one or both of the modules is the only cause left for this and I would return it to be replaced.
Your most welcome AJ
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