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I have just fixed an Aspire 7250 with following symptoms: Only blue Power LED or battery charge LED come on, fan spins, no backlight, no video either on internal screen or VGA output. Problem solved desolderig BIOS flash chip (W25Q16) and flashing BIOS 1.10 with an universal programmer.
There is a fuse for the LCD backlight only - if it's blown, you should see something on the display if you look closely as there will be no backlight. If you need help locating the fuse, e-mail me at firstname.lastname@example.org
Three immediate possibilities in order of expense:
1) Make sure the brightness is on. Press the F2 key.
2) Screen backlight could be blown out, especially if you can hear the disk seeking, fans, etc. even though the screen is black. Connect your Mac to an external display or TV using the appropriate adapters. If you get an image, you need a new backlight or LCD panel.
3) Entire machine is plotz, especially if you hear absolutely no chimes, disk movement, optical reset, fans, etc. This may indicate a power board or logic board issue.
first there could be many meanings of dims with a laptop screen one is backlight has turned off and it is difficult to see. if that is the case use you brightness key to check if it is up, if it is more likely your inverter has gone up and in worse cases the screen. it may also start bright then change dim while loading
there is also the feature on mac to automatically dim the screen a little when unused for a set time. to change this go to system preferences, go to energy saver, click show details, then move to options, and uncheck the the box that says "Automatically reduce the brightness of the display before display sleep".
i hope this is what you are talking about.
Apple doesn't provide voltage information for the Inverter Board. If you are getting external video then check to see if there is a dim (un-backlit) image on the display to ensure it is a backlight problem. If so then the chances are good you have a failed inverter board.
I'd highly recommend taking into the Apple Genius bar. You've definitely damaged something. You might be lucky and one of the connectors came loose, but most likely you damaged the LCD which will need to be replaced.