我的MAC不能開機

[aks74u]

我的MAC是G4 400
有兩個硬碟分別40GB-60GB
記憶體256MB*3 128MB*1
系統是MAC OS 9.2.2
抱歉想請教一下各位前輩，
最近幾天常常無法正常開機，
開機時當系統跑到正方形笑臉有OS 9字的畫面，
進入跑延伸功能時，
滑鼠會變成黑色圓形旋轉圖式，轉個5-6分鐘就會變成一個炸彈。
前幾天只要我重開機個3-4次就可以開機，但今天卻完全不理我，
我試著關掉延伸功能但跑到一樣的地方也是同樣的問題。
我再試著用光碟(OS9.2.1)開機，但問題還是一樣。
我想請問一下這要怎麼辦?
還有請教一下強制開機的鍵是那四顆?

謝謝各位前輩

[ashburn]

ok, it seems to be hardware related problem since you are still getting bombs while you start up from a startup CD

first unplug all your internal hard drive, and boot up with ur CD, report what you get.

second, if that still gives you bomb, try to take off all your ram, leave only the ram that came with your mac, and report here your result.

at this point, im sure you will find out what hardware that failed you