@inlerah start by removing the battery, the AC adapter and the RAM then hold the power button down for a while. Replace the AC adapter and see if it starts up. You also want to try a USB keyboard and see if that makes a difference. If not then I would suggest that you replace the RTC battery first and try to start it up after that. Use this guide [guide|61260] for that.
Any of this
Gate A20 failure
Super I/O chip failure
Keyboard controller failure
would require boardlevel repair and for that you need to let us know what exact motherboard your computer has.
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=== Update (10/21/2017) ===
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@inlerah have you tried a different memory module? You do want to rule out that you have a bad module. Your motherboard should have a few numbers silk screened on the board. Just give us those numbers or post some really good pictures of your board with your question. You can use this guide https://www.ifixit.com/Guide/Adding+images+to+an+existing+question/21499 to do so.
@inlerahstart by removing the battery, the AC adapter and the RAM then hold the power button down for a while. Replace the AC adapter and see if it starts up. You also want to try a USB keyboard and see if that makes a difference. If not then I would suggest that you replace the RTC battery first and try to start it up after that. Use this guide [guide|61260] for that.
-
Any of this
+
@inlerah start by removing the battery, the AC adapter and the RAM then hold the power button down for a while. Replace the AC adapter and see if it starts up. You also want to try a USB keyboard and see if that makes a difference. If not then I would suggest that you replace the RTC battery first and try to start it up after that. Use this guide [guide|61260] for that.
+
+
Any of this
+
Gate A20 failure
+
Super I/O chip failure
+
Keyboard controller failure
+
would require boardlevel repair and for that you need to let us know what exact motherboard your computer has.
@inlerahstart by removing the battery, the AC adapter and the RAM then hold the power button down for a while. Replace the AC adapter and see if it starts up. If not then I would suggest that you replace the RTC battery first and try to start it up after that. Use this guide [guide|61260] for that
+
@inlerahstart by removing the battery, the AC adapter and the RAM then hold the power button down for a while. Replace the AC adapter and see if it starts up. You also want to try a USB keyboard and see if that makes a difference. If not then I would suggest that you replace the RTC battery first and try to start it up after that. Use this guide [guide|61260] for that.
+
Any of this
+
Gate A20 failure
+
Super I/O chip failure
+
Keyboard controller failure
+
would require boardlevel repair and for that you need to let us know what exact motherboard your computer has.
@inlerahstart by removing the battery, the AC adapter and the RAM then hold the power button down for a while. Replace the AC adapter and see if it starts up. If not then I would suggest that you replace the RTC battery first and try to start it up after that. Use this guide [guide|61260] for that