No monitor output, no booting screen appears, no sound in the motherboard
I cannot get to the booting screen because well i guess my motherboard has already an error. As if there is no signal flowing to the monitor. Im sure that the monitor is working very well.
I have troubleshoot it myself to see where the error come from, which part of the PC. I have disconnected all the add on cards including the memory and the processor leaving only the monitor connected to the onboard plug. The same problem appear. The hard disk led is always on and not blinling as i turn on the power. The powersupply is working ( I guess) because the cpu fan and the processor fan(when it is still connected) is working. When I also turn it on, there is no sound in the motherboard.
From this I concluded that the motherboard has error. Is my coclusion right. Do I really have to replace that already.
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Re: no monitor output, no booting screen appears, no...
Try your processor to the other computer that is working with the same CPU socket to prove that is working. If the processor work to the other computer it slightly proved that the mboard is dead, but sometimes processor hang-up on the mboard try to install back processor to suspected MB, there is a 20% guarantee solving the problems.Otherwise if the processor not working on the other computer something wrong with your processors. may this help.
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Yes, the first step would be to use an external monitor. You may have to use the FN key with a function key to tell it to use the external monitor. If the external monitor works, try shining a bright flashlight on the display. If you can see images, then the display itself is probably OK and either the back light or inverter are bad.
If the external does not work and shining a light on the display does not show images, then it could be graphics card or main board.
Does the laptop make any noises? e.g. Can you hear fans, hard drive, does the CD light come on during boot up. If yes, to all the above, then the mainboard seems to be OK and it could be graphics or display. If unsure, you can remove the RAM chips and it should beep upon startup to say there is no memory and this is a good indication that the mainboard is functioning somewhat.
Good luck and post your results for further help and to let me know if you have figured it out.
Your laptop may have a combination of problems. Since the laptop was dropped, it is possible that your may a motherboard that no longer outputs video through the video controller, or the screen may have been damaged internally. Try hooking up an external monitor through the vga output of your laptop, usually located on the side or back of the laptop. If the external monitor works, then most likely it is your screen that's bad, if the external monitor doesn't works, then most likely it is your motherboard that's bad.
Sounds like either the screen or the video adapter has gone bad. Do this: Connect the computer to an external monitor (there is a SVGA plug on the side of the computer. Be sure when you turn it on that you press teh Fn-special function key combo that switches the video output to the external monitor. If the external monitor works, then it's your computer's screen. Possibly the inverter. If the external monitor shows nothing, then it's the video card (which may be built into your motherboard).
RAM would be my next guess. If the board is bad, so could the RAM be as well. Try swapping some known good RAM and see what happens. Or, at the least (if you have more than one stick), remove all but one and try again. Repeat until all sticks have been tried by themselves - you could just have one RAM stick causing the problem.
However, usually even if you have one bad stick, your system will still post, just show less memory. On the off-chance that all sticks are bad, then you might have similar symptoms.
Have you tried booting into "Enable VGA" mode via the "Windows Advance Option" screen? By press F8 before Windows XP loading screen comes up. In this mode the Video Card drivers are disabled. So if your screen appears normal and not white in this Mode then it is your video card drivers which are causing the issue.
If you notice, when you see the windows start screen, its usually "big and dopey". Thats because the video drivers aren't being used yet. If it is blanking out right after you see that screen (with the scrolling bar), my guess is it's a corrupt / bad video driver.