I use an LG R200 laptop. It has an auxilery display that has windows sideshow on it so that I can access laptop information without having to turn on the laptop. Unfortunately, recently it stopped displaying windows sideshow but instead it started displaying some firmware settings. I tried going through the settings to see if I could get windows sideshow displaying again. However, I accidentally deleted the firmware completely and now all that displays is the basic bios for the system. Through the bios I can install a new firmware but I don't have a firmware to install.
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I'm not sure how resetting the EEPROM to factory defaults will suddenly get the inverter to work. If it is the original inverter, it is incompatible with the tubes in the new display, or the EEPROM display parameters need to be changed to adjust its operation. A different inverter may likewise need a parameter change. Perhaps that can be done in the BIOS setup, but you may have to find the firmware version used with the LG display option and flash that in.
It still seems more likely to me that one of the cables to the inverter is not properly seated or you have a defective (broken?) fluorescent tube. The fact that you can't get any change from the brightness adjustment is a strong indication of this. Check this out before you take a chance on firmware hacks.
Outputting to an external display is only possible through Windows. As you stated External Display works with the computer, its sure that the issue is with the LCD. Performing a System Recovery is not going to help. The screen needs a replacement. To confirm this restart the VAIO and press and hold the F2 key and check if the computer boots to BIOS, if it boots to BIOS, then the screen is fine. Based on the information you have provided, I'm sure that the LCD will exhibit the same issue in BIOS and screen will stay blank.
As far as the recovery process is concerned, if you have not changed the preinstalled OS in the computer, you can still access the VAIO Recovery partition from Help and Support. You can also access the Recovery Center following the below link: C:\Progrm Files\Sony\Recovery Center.
To initiate a service process, you can visit the http//:eservice.sony.com or can get in touch with your favorite technician.
I would boot in safe mode and attempt to run a scan for viruses or malware. That is what I would think the problem was
You could also do a system restore to before this problem started in safe mode. If you dont know how to get to safe mode google it. something like "Safe mode Windows Vista"
First try deleting the device and resintalling with the drivers that came with the machine. If you do not have then get them from your manufactures website. If I have the laptop model I could help you with that link but as I do not you will have to get to this part solo.
If not luck then I sugesst trying this fix next. http://mycomputergirl.blogspot.com/2007/02/cd-rom-access-is-missing-and-messages.html
If that doesn't do the trick then try updating the firware for the device but I suggest trying that last. Firmware updates on this stuff is not always the best advise. It is best to get this from the laptop manufacture's site or you can do a search for the LG GSA-T10N and get it from a website like this here: http://drivers.softpedia.com/get/FIRMWARE/LG/LG-GSA-H10N-Firmware-JL12.shtml
I hope this advise works for you.
This is a common laptop issue. The lcd has what is called an inverter that changes the power to hat is required to run the lcd. It is very easy to replace but you need to revove it first to find out the part number. There are several on ebay for about 35 plus shipping. A good computer tech will be able to take apart the lcd housing to find the part number and even order and replace it. Shouldn't cost more than about 150 if the inverter is a brand new part and less if it is used