Hello,

Perform the following steps:
-Remove the battery and Power adapter
-Press and hold the power button for 30-45 seconds (with battery and power still removed)
-Insert just the battery and attempt to boot the laptop.
-Insert just the power adapter and attempt to boot the laptop.

If still unsuccessful: Remember to remove battery and power before removing/installing components

-Remove the power and battery
-Remove the hard drive from the laptop and attempt to boot with the battery installed. Do you receive any error message?
-Remove the memory modules from the laptop
-Insert just the battery and attempt to start the laptop (you should receive beep error)
-Try inserting just one module of memory and test (swapping modules after each attempt)
-Remove the optical drive and test.
-Try disconnecting the CMOS battery for a few minutes then re-connect and try.

How to take apart a Toshiba Satellite P305 series notebook

 

i tryed all exept the last two ones (im not that confident in my skills)

when i removed the harddrive no error.

when i removed all of the memory modules i just got a black screen.

Is there anythiing ese i can try?

 

At this point best recommendation would be to take the laptop to a local repair shop to have diagnosed.

Any further steps would most likely require disassembling the laptop.

It is possible that you have a faulty motherboard.