|Dell Inspiron 15z 5523, 8 GB RAM, 500 GB hard drive, 32 GB SSD, Windows 8 (upgraded to 10 this past August)|
Got this laptop brand new in Jul 2013. Have never really had problems with it 'til now.
It all started when I changed the UEFI boot settings to boot from my USB external hard drive. After I restarted the computer, it wouldn't start correctly. I turned the laptop off, and when I turned it back on, the fan and drives started spinning, all the LEDs lit up like normal. But, there's no POST, no beep codes, screen completely black (backlight won't even turn on), can't get back into the BIOS to check the settings. Charging LED doesn't light when I plug in my AC adapter. I don't think the keyboard is working correctly, either; the keyboard backlight doesn't turn on like it's supposed to when I turn the laptop on. I think the mobo is still OK; when I removed all the RAM sticks and powered the laptop on, I got beep codes again.
I've done multiple hard resets by removing the battery and holding the power button for at least 60 seconds. I've cleared the CMOS multiple times by removing the CMOS battery and laptop battery, and holding the power button for 15 seconds. I've tried booting without my CD or hard drives connected. I've tried booting with just my external hard drive connected. I've tried booting on just AC power, with CMOS and laptop batteries removed, and no drives connected.
Some of my research suggested the problem might have to do with the HDD being bad, so I installed my laptop's HDD inside another computer as a secondary drive. HDD is fine, I had no problems reading the files on it when it was in the other computer. I don't think there's any problems with my external drive either, since I was able to connect it to the other computer and browse through the files just fine.
I've tried just about every fix I can think of. One thing I can think of that I haven't tried is removing my SSD. Trouble with that, however, is I don't know where the SSD is located in my laptop. Dell's user's guides hardly even talk about it; I've never used it for anything, it just came preinstalled in my laptop.
Another thing people suggested is resetting the CMOS jumpers. But since I have a laptop, I'm not sure that fix applies to me. If it does, I can't find the jumpers on my laptop's mobo. (Dell's user's guides didn't mention jumpers.)
I'm sorry this is a longer post, I'm just really frustrated all this happened just because I tried to boot from an external USB hard drive. I really don't want to take it in to the repair shop if at all possible. Anyone's help or suggestions would be greatly appreciated!!! (I apologize also if this isn't the right category to post this...)