iMac 400DV SE를 구했는데, 전원케이블을
연결하고 키보드의 전원버튼을 누르면
전원들어가는 소리(딩~)는 들리는데 화면이 먹통입니다.

어디에 문제가 있는 걸까요?

ifixit에서 검색해보면 아래와 같은 질문과 답변이 있는데, 정확히 어떻게 하란건지 잘 모르겠네요.

질문:
On start up I get the tone then immediate shut off

I push the power button, get the start chime and the power is immediately turned off. Pushing the power button again will do nothing.

If I unplug the device and plug it back in I can again get the start up chime but same result with immediate shut off. I have had the machine for a few years and it has worked well until this occurred, which may have been triggered by a power outage.

답변:
I had this problem a long time ago with my imac g3 333Mhz, it would chime, and try to power up, and in a few seconds, shut off, in the end, i needed to replace the board that drives the CRT, try running the computer with the internal display disconnected, i believe these iMacs have a VGA out port on the back as well. This board is hard to get to, but after a little disassembling, i got it, if you decide to try this, take a picture of all of the connections, since it was really hard to remember where every thing was connected.