Dell Inspiron adapter problem

My old laptop is a Dell Inspiron E1705. I have been trying to figure out what is wrong with the laptop but after talking with dell representatives and searching the internet, I still have not come to a solid conclusion. So here is the problem: One day I plugged the charger into my laptop and a very high pitched noise began. I couldn't stand the noise so I went to unplug the charger and when I did so the laptop shut down completely. I then had to put up with the noise whenever I was on my laptop but very soon after this problem started I noticed another problem beginning. I am not sure how exactly they connect, but as time went on my computers screen gradually became dark with a very red tint to it. I can't use my laptop during the day because even when it is set to maximum brightness I can barely see anything. Now I have a few different adapters and each adapter I use the laptop still has the problem. When I do not use the computer for days at a time and turn it back on the screen is perfectly clear but as soon as the charger is plugged in, it is only a matter of time till it turns dark and red again. I would appreciate any suggestions or advice! Thank you!