Question Error codes 03 and 15. Motherboard won't boot

Oct 11, 2021
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Hi, I have an Intel dz77bh 55k motherboard. I am getting error codes 03 and 15. My computer won't boot. Can anyone help please?
 
Oct 11, 2021
11
0
10
0
Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz 3.40 GHz
RAM 24.0 GB Crucial DDR3L 1600Mhz 8GB x 3
PSU Corsair RM850 80Plus Gold

I have removed all RAM sticks and tried them all one by one. I have four, a whole set. The computer turns on with three of them.

Also, I have replaced the battery because I was getting a message saying that the battery was not working and the message is still the same. It is as if the battery is not connected to the rest of the mother board.

Thanks for the help.
 
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