感謝各位
似乎是記憶體問題,全部拔掉換成beep一聲,插上一根就有螢幕...逐一插上沒問題
網路上回覆的代碼表漏了後段....
樓上連結的
4 short System timer failure The system clock/timer IC has failed or there is a memory error in the first bank of memory

google搜尋案例似乎....很多都是華擎主板