ASUS A42F won't post

[nattas]

Two weeks ago, my Linux based os detected that the last mount time was in the future, meaning that the cmos battery was dead. so yesterday i opened the laptop and replaced the battery, then it booted just fine into bios. so i changed the date and turned on UEFI, (no HDD inserted to the laptop yet) and powered it off. a couple of minutes later i wanted to get into bios again and then it didn't work. blank screen (no backlight) and the power LED turned on, then 30s later the laptop shut down. since ten i have tried everything. booting without a battery(AC only), battery only, no cmos, no RAM, no network adaptar, i have dully disassambled the laptop, and replaced the thermal paste. even reseated the CPU. i dont know what to do!
thanks in advance!



UPDATE!
CPU is REALLY hot, and the fan wont spin up to cool it.

 

[nattas]

get usb stick, smaller size is better like 1-4gb max. download latest bios to your model from asus site. unzip and rename file to K42FAS.BIN
Format your usb drive to FAT , after that put this renamed file K42FAS.BIN to your usb . plugin your usb to main usb ports on the motherboard ( right on motherboard not on some extension board) . remove battery and power cable. press and hold CTRL + HOME buttons without power cable and battery plugged, plugin charger cable with still holding ctrl+home buttons with your other hand, keep holding. If this dont work and it wont boot automatically then keep holding ctrl + home buttons and plugin cable + press power button

will try that

 

[fagetti]

i dont think EC bios is corrupt cause you said it will recodnize with flashing that ram is missing and powers ram etc. for EC bios you usually need spi programmer because its fully bricked and wont even turn on, also it can be on another chip with 100+ pins its insanely hard to reprogram 😀

 

[nattas]

get usb stick, smaller size is better like 1-4gb max. download latest bios to your model from asus site. unzip and rename file to K42FAS.BIN
Format your usb drive to FAT , after that put this renamed file K42FAS.BIN to your usb . plugin your usb to main usb ports on the motherboard ( right on motherboard not on some extension board) . remove battery and power cable. press and hold CTRL + HOME buttons without power cable and battery plugged, plugin charger cable with still holding ctrl+home buttons with your other hand, keep holding. If this dont work and it wont boot automatically then keep holding ctrl + home buttons and plugin cable + press power button

nothing

 

[nattas]

i dont think EC bios is corrupt cause you said it will recodnize with flashing that ram is missing and powers ram etc. for EC bios you usually need spi programmer because its fully bricked and wont even turn on, also it can be on another chip with 100+ pins its insanely hard to reprogram 😀

i dont think ill be able to fix this laptop... will just get a new one,,, thanks!!! 😀

 

[nattas]

you can try also hold power button + home + ctrl (try both ctrl buttons on keyboard) when plugging in power cable
another one is f2 + fn and fn + esc. Try rename file to AMIBOOT.ROM and try again

nothing... just continues to heat up

 

[fagetti]

yep usually you have to flash some modified bios to really brick or mess it. too bad

 

[fagetti]

one more thing try brightness key i know this is a nobrainer but still you cleared cmos. after booting press F3 or FN + F3 many times to get brightness. your laptop might have another key for it... TRY pls

 

[fagetti]

actually ignore last one forgot you dont even get asus screen 😀