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POST and BIOS Question: Dead laptop I`ve been given a Fufitsu Amilo L6825 laptop which is faulty.( It fails to get by the POST test so doesn`t even reach the BIOS option.(It switches ON, fans run but black screen with no BIOS beeps. The only light lit is the ON light ) Using substitution and known working spares, (I have the same model of laptop) I have deduced that the original problem was possibly due to a faulty harddrive .(does not work in my laptop) However, even with a known working harddrive, it still does not boot up (no display , no beeps) I`ve gone through the usual method of faulting by disconnecting the CD Drive , HDD , memory : stick removal + slot swops ,battery removal , screen swop , power unit swop etc. and still no joy...plus a visual check of the circuit board for damage or overheating or blown capacitors etc ) plus a ''Default Reset'' by pressing ON button for 30 seconds To me , this now looks as though the problem might be on the motherboard. As it does not seem to go through the initial POST or BIOS checks I wondered whether it might be the BIOS. Fortunately it is a removable chip so I swopped it...Still fails as before. The only other option available to me now was to try and swop the CPU................Swopped and Still fails (note both CPU and BIOS chip still work OK as fitted back OK into my own laptop ) Anyone any idea what to do next? I assumed that the BIOS chip controlled the POST test...but does it? If not what does? Any suggestions most welcome

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  • xxxxxx xxx May 29, 2010

    Judging by what is said on here and elsewhere, it looks as though everyone gives up at the point where it points to the motherboard.

    I was hoping that someone on here had the actual experience of faulting a motherboard down to an area or component or giving a few pointers as to what problems are actually found ...or nowadays do computer technicians (both amateur and professional ) just throw a complete motherboard away and replace it with a substitute ?

    I understand that a common point is the power supply ,(eg the 1.8v rail ) but something within the power supply circuit has to have failed and could possibly be tested or have some visible sign of failure.

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Since you swapped everything, the last option will be the on-board power supply. If it has failed, then nothing will work. As a guess, I would assume the 1.8v power supply for the CPU has quit.

Posted on May 27, 2010

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