Autoresponder for You

I have a MacBook Core 2 Duo 2.16 Ghz 4 GB ram 120G HD
Has been working flawlessly for near 3 years , 4 months ago I replaced the HD with a new one of the same due to errors.
Working on it last night and was working fine then I heard an audible click and felt on the keyboard what felt like a light pencil tap and the screen went black and at the same time the light in front of the computer that normally indicated sleep mode came on but it came on steady , It refused to (wakeup) . I shut down the computer holding the power key Many times , Removed the battery , Restarted the computer many times and it always returns to the same condition . Light on steady , black screen. I even tried to boot from a external HDD with OS 10.4.9 , Same condition. The backlight flashes on for a split second every time I restart . then goes off.
I can replace anything that goes bad on this computer but I cannot afford to throw money into parts not knowing what is actually bad . I have no way to test . Warrentee is out now .
I am thinking logic board , Maybe inverter

I do not want answers from PC nuts
I would like a reasonable answer from someone that knows MacBooks
If you know something for me to try , Let me know
If you know how to test something , Let me know
In way of reply , I am not familiar with a PRAM Zap, Hold till it chimes ?
I did hold the power button until it flashed the sleep indicator light rapidly . ( something that was suggested )
Never spilled anything on the computer , I have a special slanted rolling desk with only room for the computer to prevent temptation of setting any drinks down near the computer . I dont know if it would be worth a Logic board as I might just get a new one . The logic boards I have seen have been $500 but I might consider upgrading to the 2.4Ghz if it would fit in the same case .
By the way , it is a 13.3 inch MacBook I was considering a new palm rest as the current one has a small ***** in the lower right edge from trying to pry up . Minor but not expensive to replace
Also Do you know about the places that through E-Bay repair Logic Boards ?, Usually around $200
Try them or stay away from them ?
Would love to chat about this

Recently, I was introduced about laptop with wireless internet connection through cell phone that has internet. Instead of connecting through a cell phone, is it possible to connect through an existing modem (dsl) that is currently in use at home (without a router) ?

My computer is not currently capable of a wireless internet connection. I don’t want to pay a bunch of money for something that won’t work, so my question is what type of adapter or plug-in do I need to by in order to create a wireless network and internet connection to my laptop. (I already have a wireless router.)

ok, I installed my wirless router into my host computer. I have the modem connected to the router (grey cord) and the router connected to the computer (blue cord). when I take the grey cord out of the router and put it into my laptop, I get internet connection. But what I want to know is how to get my laptop connected to the internet wirlessley. Please help.

I have a Dell Latitude D620 that’s designed for microsoft XP. At one point I was getting internet some how but it stopped like five months ago.It does have bluetooth. I tried to fix it but I think I may have made it worse. I do have comcast on the home computer but i still can get internet Wirelessly on my laptop! If you can help me that would be awesome!!! Please i need it for school too.