電腦自動關機????

圖片參考：http://hk.yimg.com/i/icon/16/7.gif
Switch off automatically?
My case is as same as yours, as I using the computer, it switched off automatically, but I cannot start it again, I have to wait a few minutes or an hour or a whole day.
This mostly is your computer AC's problem, as you touch it surface, you feel it is extremely hot, because it's fan(s) does(do) not work, you can check it(them), one is at the back of the computer, another one is in the main unit.
Why do the AC's fan(s) may make the computer switch off?
As the AC is working, it will produce electricity (Changed the voltage) and heat, and it is in the main unit, so the ACs have to add the fans to make it cool down, or it will overheating and case fire.
If the fan(s) fails, it cannot cool down the AC, it become hoter and hoter, it will switch off automatically to protect the hardwares from overheating, or the AC and other hardwares will snap.
Before you replace the fan(s), you can open the cover of the main unit temporary, the fresh air can make the AC cool down too.

2007-04-18 22:35:56 補充：
[Tips]有以下問題但仍能開機。硬碟壞掉：1–如已開了機才壞硬碟，Windows即時轉藍畫面。2–如是剛開機時，BIOS無法偵測硬碟，但主機不會不著。RAM或CPU壞掉：1–剛開機時，BIOS先偵測和檢查所有硬件，RAM或CPU壞了BIOS會指令主機發出嘟嘟聲。鍵盤或滑鼠出問題：1–BIOS偵測和檢查所有硬件後，進入預備啟動Windows的畫面，鍵盤或滑鼠的插掣鬆了的話BIOS會在屏幕上提示你插緊它。2–如是鍵盤或滑鼠出問題，不是插掣鬆了，BIOS會指令主機發出嘟嘟聲。

2007-04-18 22:43:30 補充：
[Tips]有以下問題但仍能開機。底板壞掉：1–剛開機時，BIOS先偵測和檢查所有硬件，底板壞了BIOS會指令主機發出嘟嘟聲。Windows損毀：1–開機後無法進入Windows，留在BIOS檢查的畫面。中木馬程式、病毒或蠕蟲：1–開機後大多的仍能進入Windows，但問題瀕生。2–有些病毒能令硬碟損壞，會令電腦經常轉藍畫面。

散熱不良，令CPU過熱，加裝良好的散熱裝置如高級的處理器（CPU）散熱風扇，應可解決。

打開機殼望下CPU風扇轉唔轉, 可能係底板保護裝置為你自動關機, 防止CPU過熱!

試下清理下上面d 塵. 如果散熱扇唔轉, 就要換過把...