Led #1 Blinking Blank screen, No chime
I just installed a new power supply, and the same blinking Led 1 shows up. No chimes, blank screen, Upgraded to High sierra with externalUSB 3 SSD. When i try to start the yosemite from the HDD internal. the system shutdown and never comeback to life.
Yes I plug back the External SSD but never start again no life signal. My keyboard and mouse are bluetooth wireless and try with wired keyboard and no light turn on. and no response.
SO what the blinking light would mean… so sad.