No booting, S.O.S beeping, black screen
After pushing the start button, my mac gives 9 beeping (S.O.S. signal) the screen is black. No booting, fans are working but the keyboard is frozen.
The diagnostic LEDs:
RAM and display are not connected.
LED1 is lighting
LED2 is lighting after pushing start button.
LED3 and LED4 are not lighting.
What can be the problem? Logical board or graphic card?
thanks for your help
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