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All I can think of is either a bad OS or bad connection of tiny wires between monitor and mother board. My husband replaced the monitor on my notebook once. I couldn't believe how intricate it all was.
To change the Ethernet port you need you open up everything and tell some technician who can repair mother board. But still i'll not suggest you to do that because after repairing mother board you never know when you might get some other problem too. So i'll suggest you to buy and use USB to Ethernet converter which is Cheap and easy to use also.
1. you possibly have a malfunction inverter board which is internal to the PC. 2. this will require a qualified tech to dismantle the pc and replace the component board that connects to the video card that is integrated to the mother board. 2. if the video card is not working this will require a new mother board to be installed. 3. there is a cable also in some models that connect the video display to the mother board and this cable could have be dislodged and the results is no screen.
Before you buy a new mother board, (the L300D-13S board is around $185 from China), remove your battery, leave it for about 5 minutes. Use only the Mains power supply and see if it will switch on. Fit the battery, plug in the Mains Charger and see if the battery charge light comes on. If it does and it won't give you a screen or flash the hard drive light or power up the hard drive, then I am inclined to go along with a replacement Mother Board. The laptop has to complete the POST and if it doesn't that usually points to Mother Board problems. Were you trying to upload a newer version of the BIOS before it failed? Good luck but check ebay and beware there are some really dodgy frauds out there.
Might be the power cord is faulty.If you have checked this with any other computer then inverter board on your main board is faulty or the dc in cable (the cable connecting power jack to mother board).
They sell USB to Ethernet adapters that you can use. If you want to replace the adapter yourself you will have to strip the laptop down to the mother board, then proceed to de-solder then solder the new one back onto the board. You can but the replacement piece from either http://sparepartswarehouse.com if they have your make and model, or you can get it from your laptop's distributer.