Dell 640M 指示燈閃,CPU風(fēng)扇不動(dòng)，LCD無(wú)反應

故障描述：按開(kāi)機鍵，電源指示燈亮，CPU風(fēng)扇不動(dòng)，LCD無(wú)反應,

LED:Numeric keypad 指示燈亮,

Uppercase letter function指示燈閃亮

Scroll lock指示燈閃亮

過(guò)30秒后, 全部燈不著(zhù).

保修已經(jīng)過(guò),

Dell 說(shuō)底板壞, 我在網(wǎng)上查到的是,找不到RAM, 是不是北橋IC壞?

Diagnose Dell Beep Codes Flashing Flash LED Error Diagnostics POST Bios Service User Guide Manual. Dell Post Error BIOS LED Beep Fault Codes
Diagnostic Light Codes During POSTThere are three LEDs on most Dell systems, the flashes and combinations can help fault find.
One LED On, Two LED flashingON FLASH FLASH - No memory modules detected
Two LED On One LED flashingON FLASH ON - Memory detected but you have a failed module.
One LED flashing Two LED OnFLASH ON ON - CPU or processor failure
& s. i, @3 |6 H7 R+ {Two LED flashing One LED OnFLASH FLASH On - Graphics card failure
  E$ {* k3 [9 J! q7 [Two LED flashing One LED OnFLASH ON FLASH - LCD Failure
Two LED flashing One LED OffFLASH FLASH OFF - Keyboard failure
& C$ o+ }, H2 @- `* G+ qTwo LED flashing One LED OffFLASH OFF FLASH - USB failure
To troubleshoot a problem with your computer, read the sequence of the status lights in order from left to right Num Lock, Caps Lock and Scroll Lock
If the computer malfunctions the individual lights display a status of either On , Off , or Flashing .
" O* q) ]/ q) t* o
dell beeps leds led flash 1 2 3 4 5 bios post error beep buzz once twice three four five times problem flashing code diagnostic beeps boot power on self diagnostics



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電流多大？一般燈閃是內存不過(guò)