Black screen GS75 Stealth 9SF-243US Suggestions PLEASE

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do15ac02e2

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This laptop, GS75 Stealth 9SF-243US-BB7975H16GXXDX10MA It set for a long time and now I can not make it boot up, I plugged it in overnight, When I press the power button the red light comes on, I do not see any other lights and I hear the fan running. The screen does nothing. I found the reset hole so this is next
 

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So I did this, the cmos battery was DEAD, I have it replaced now, I have tried removing the HD, resetting with the battery hole, now I am trying the memory sticks in slot one. I have one stick left to try. Are there any hotkeys ? that will help bypass things or are their any keys that might bring up special menus for diagnostics. ? So the HDMI reacts, then it says cant find anything shutting down. I've tried to boot with the external hdmi monitor as well. It seams these laptops are finicky about booting. Like perhaps if I put a bootable flash in it might react. thing is its not getting the MSI logo - A red light comes on, two of the 3 fans come on. at first it would turn on then off then it would try to turn on it would start running the fans with the red light on on the power presser button. After replacing the Cmos battery it no longer does that.
 
Where do I find the post codes for this ? where can I download the service manual for this ? I believe this laptops slot 1 is faulty but how ? it set for long enough to drain the bios battery, and apparently when these set for a long time they can get corosion on the memory slots and then it is not able to retrain the memory on boot. When I put the memory in slot 2 it showed the keyboard light up in a circular motion and the laptop turned off. This tells us its not the main board or the GPU RIGHT? --- ALSO on a separate note I was told the GPUs in these go quick - can this be due to cooling? would a laptop cooler help this or some other modification ?
 
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