My toshiba portege M400 laptop will not start up, when I turn power on the power light starts blinking yellow and does nothing

Toshiba Portege M400 User Manual Fingerprint Reader Limitations
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Sounds like there might be dust inside of the laptop that is blocking one of the air vents. Plus the connectors to the screen may need to be reseated so that way the screen can be moved freely without it locking up on you and cutting off.
You have two issues going on. Bring it to somebody so they can open it up and make sure the air vents are cleaned out. Also they need to make sure the CPU fan is running properly. Then with the screen the connectors need to be reseated. Its also quite possible the screen connector might need to be replaced.
If the laptop is under warranty see if Toshiba will reapir it.

have you had any power surges lately?
Try taking the battery out of the laptop and starting just on power.
if this doesnt help then take battery and power and leave laptop for few hours then try again on only power or battery.

Let us know how it goes.

You look very much the unlucky owner of a busted battery.

I'm afraid the battery will have to be replaced. Meanwhile, do not use it with the power supply; not only it will do no good, as you already determined, but it might damage the power supply itself.

hi dear i dont think you can any test on this my addvice is take to toshiba service center ...

thnx

I have the M400 and it also does this. I don't know much about computers, but I found out when you apply a little pressure to the left of the touchpad and beneath the keyboard as you're flipping on the power slider, it boots up much more often. I know... sounds crazy and stupid, but it works for mine and it's been doing it for almost a whole year now. It doesn't work everytime, but whenever the light flashes and the fan cranks up to a million RPM i just pull the battery out

need a toshiba mother board for m40x250

hello jpmca

try to take off your fan cable

here http://slashstar.com/blogs/alex/archive/2006/09/30/Toshiba-M400-Fan-Hack.aspx

and try to release the memory sodimm, release the battery and plugin the power cord again

if problem solve try to updated your bios for fan noise solution

here
http://support.toshiba-tro.de/kb0/TSB6A01KJ0000R01.htm

oke


cropp

Any hope you may have left other than an expensive repair, is to remove the battery and leave the unit in an airing cupboard for a week and pray. Then replace the battery and try again. No change - then nothing lost. I know it's basic, and best done as soon as the damage was done, but has worked for me in similar circumstances. Don't be tempted to use a warm oven.

hello salg


there something problem with your memory i think ,
release the memory sodimm and try to plugins power cord
after that try to put in memory again

for certainly ...you can counting the beep by number

i hope this solve your problem


thks

cropp