Does not power on after SMC reset, will on SMC bypass.
Alright, bear with me here because I am by no means an expert and there is a long story. This computer was running perfectly up until about a year ago when I dropped it. After doing so, the hard drive would not boot and the screen cracked. I took it to the Apple Store and they basically said that I was SOL and that I should just buy a new computer. Since I already had an iMac, I just decided that it was good enough for what I needed to accomplish.
Recently, however, I remembered (go figure) that I know how to work on computers and decided to get a bit adventurous. I bought a new LCD display and HD for the computer and replaced them both, along with a new keyboard. After reassembling the computer, it would not respond by pressing the I/O button; no flashing lights, no whirring fans, nothing. After a little digging on the internet, I came across a description on how to start up a MBP that seemed dead by unplugging the laptop, holding the power button for 10 secs, plugging the computer back in while holding the power button for an additional 10 secs and then releasing and pressing it again to get it to boot. This worked beautifully and I was able to install OS X onto the computer.
The problem with this, however, was that the fans were running at max, the keyboard backlight was not working, the computer seemed to be running a little slower than desired, and the magsafe LED wasn't responding to the battery's current charge state. Since I assumed the battery to be dead after sitting around for the better part of a year, I figured the last part to be of little issue. I later found out that what I was doing was bypassing the SMC which explained quite a bit. I then tried to reset the PRAM and the SMC (in that order) and the computer would again not turn on. It seemed that every time I tried to do an SMC reset, the computer would not turn on.
Frustrated, I took the MBP to the apple store and the genius there ran a hardware test to find that my CPU 0 Die Analog and Right Fin Stack Proximity sensors failed the hardware test. He told me that either there were loose cables or the logic board was bad. I decided not to give up and went home and took the computer back apart and carefully examined the cables and the logic board itself. The board looks to be in great shape (aside from a little dust), but I did notice that my left thermal sensor was not seated properly and that my right thermal sensor had a tiny piece chipped off the side of the seat. They both, however, seemed to seat firmly in place once I put it back together. After reassembly, I tried a reboot and still had to bypass the SMC to get it to start. Also, iStat is saying that both fans are at 0 RPM, which can't be true because of their attempt to imitate a Hoover vacuum, and that the left and right sensors are reading 32F.
At this point, I'm getting a little antsy because I feel like I'm almost there but I'm not sure of what other steps I can take. I did stumble across something stating that the MBP will not start up properly if you are using a 60W magsafe, which is what I have. I was gonna try to order an 85W from ebay and see if that helps. Also, at the Apple Store, the guy put in a working battery and the computer seemed to recognize the battery which it is not doing with my current battery.
Any help would be greatly appreciated! Thanks ahead of time!
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I would like to add that I tried to update the computer to Mountain Lion to see if that would help with the issues, but that caused the screen backlight to turn off once the OS booted up. When I went back to Snow Leopard, though, the screen backlight works 100%.