Black screen on boot but chime sounds
I have just been given a Macbook 2009 that wont turn on. When you press the power key you hear the normal boot chime but no picture appears.
The laptop was given to me without any hard drive, so I installed a blank 250GB HDD. The HDD has no OS on it, and I am not sure how it is currently formatted as it is new.
Even when I use an external screen and regardless of whether a HDD is present the macbook does not show any sign of life on the screen or external screen but still chimes.
Any help would be great,
From your question update I understand that the macbook GPU is good and you get video on internal and external screens but no lightning on the internal. This is often a problem caused by liquid spilled on this macbook model. You should carefully clean the LVDS socket that brings video and lightning to the LCD screen. Check for socket internal discoloration like black spots or corrosion. Clean it with a tooth brush and 90% isopropyl alcohol. Check also the LVDS cable connector which may need to be cleaned too.
Are you using the external monitor correctly in clam shell mode?
Try this first , put the installation dvd. Power it on without pressing anything any key commands , immediatly close the lid when it fires up and plug in the external monitor wait with the lid closed unitl the installation dvd comes up. If all goes good you will be able to use your mac and at least know it works , but this will tell you if you your screen or video cable or backlight or backlight fuse is bad. Then on to the next!
You could also shine a light into the middle of the screen and look for the blinking folder icon, that would indicate the backlight is not working. If it is an MC207 model, it is a LED-backlit screen and will need to replace the whole screen.
As I understand it that is a problem with the GPU and reballing the solder underneath will fix it. There are plenty of repair places you can send it to for 100-125ish to fix it. This is not something that would be able to be done at home with normal tools. I have also seen a temporary fix of using a heat gun to attempt to resolder broken points, but its only a temporary fix when it does work, and most of the time it does not.
I would bet money you have a in-line p link fuse or the WLED driver which is a QFN chip blown. Your going to need to need some real expertise to test the QFN chip with very fine probe tips to test it and there is a possibility of shorting the board cause the contacts are so close. Me personally? I would change them both but soldering a QFN is extremely hard youtube QFN and you can see what i'm talking about.