Toshiba satellite m305d-s4828 no bios post, no beep and display I tried to connect to external monitor and still blank I have check the video cable connected from system board to LCD they are good. Replace Memory Card still no bios post and display. Clean the processor fan and applied fresh thermal compound still the problem is the same.

Hook up an external monitor to determine if you have a logic board or LCD problem If the external monitor works the trouble is with the display or its cables. You should also double check that your memory is properly installed and you may want to replace your bios battery. you will need to aquire a toshiba manual for your laptop to help you fix these issues. here is the link for finding your manual Search

Check your settings,both bios and display,for the display priority.Either the settings has been set to inbuilt display and thus cant display on external monitors or the external monitors have been disconnected in bios settings

i'm sure you ment inverter..if its working on external screen? it would seem. that you still need it replaced have u checked the ribbon cables?

What do you do to try to wake it up? Try to push the power button

To use external display, Connect an external monitor to your laptop. Start your laptop and use Fn+F5 buttons
also try to go to enter password 3 times. and note given error code.
use this website to try make passcode online by type notted code
https://bios-pw.org

The problem might not be with the LCD inverter. There is a possibility that you have a faulty LCD screen cable. The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board.
Please check this possibility.

will video work when first booting?? try to start in safe mode then if you have restore disk or applications disk remove the display video in hardware manager, sometimes the drivers get corrupted, thei may re-install video drivers. al so you might go into bios and check for setup defaults hope this works. have had similar situations on diffirerent systems. some laptops have a Fn key Function key so when you have external monitor up to system it switched=s from laptop monitor to external little picture on keys usually on or near function keys.

You need to:

- Connect everything with the laptop turned off
- Boot the laptop
- Use the Fn key plus F8 or F9 (I'm trying from a small picture of the keyboard!) to cycle through the external display options.

do you see anything on screen to begin with?
if nottry removing ram individually.
use an external monitor to see if you have video if you do then you need to tighten the lcd harness as i have noticed on a great many m305's that the lcd and harness become separated, causing the lcd to flicker
if not you need a motherboard

I recommend you to reinstall the display drivers of your laptop as the issue may occur due to the corrupted display drivers.

Uninstall the display drivers from Device Manager.
Expand Display devices.
Right click on the display device and select Uninstall.

On restarting the laptop, windows will detect the device and reinstall the display drivers.

You can even install the display drivers from your notebook support website:

www.csd.toshiba.com