Help Phone wont boot after replacing charger port.

[Shmendrich]

So here's how it went:
I opened the phone, replaced the port (the small boardlike thing)
assembled my phone to try it.
The phone started
Then I put all the screws and sim card But I didnt get signal no matter how long I waited
So I dissassembled it again. I was a bit harsh and broke the "Power" button. (the rubber thing that makes it bounce fell off, and an small metallic circle that probably completes the circuit fell off as well.
http://image.dhgate.com/albu_353133123_00/1.0x0.jpg (lower right corner)
Checked everything was plugged properly and tried to start it with the tip of a paper clip to complete the circuit where the power button should be (that small round thing)

Nothing happened so I googled a method to start it without using the powerbutton:

Basically its to plug the charger, wait for the battery logo to show, unplug, take out the battery and put it back in quickly.

So I assembled the phone again to try that and when I connect it to charge it the screen flashes for half a second (no words no nothing, it just brightens up for a bit) And then the red led that means its charging turns on after a couple of seconds.

After doing the trick, the led turns on blue....then the phone vibrates a bit(seems its starting up, but with no sound or nothing in the screen)

And then the "menu" soft key blinks a couple of times and then back to nothing


So I just have no idea what to do @.@ I dont mind replacing the button but I would rather not spend on it if there's something else wrong with the phone...any ideas?

And I just bought this to replace another phone that broke ;_;

 

[Shmendrich]

I'm guessing its one of those:
- I ****ed up the screen (I HIGHLY doubt that, While I was a bit rough and pushed the plastic tool I was using to open it in to the power button, I dont think I did any amount of pressure anywhere that could damge the screen)

- Trying to start it I shortcircuited it. I only touched the center of the power button flexor thingy to try and complete the circuit. This could have damaged the motherboard maybe?

- The power port I bought had a shortcircuit

Any other ideas tho? or suggestions to try and fix it or to help me determine what is wrong?

 

[Shmendrich]

Update: I found 2 more symptoms
1° Kept restarting the phone with the battery trick, and a couple of times I could hear the music of the phone starting up, but it seems to be at random or due to some factor I have not spotted yet
2° If I connect it to the computer it detects the phone and lets me access the files. Kies detects it as well