Notebook refuses to POST

[Cali3350]

Hey guys, I had to replace the DC jack in my Inspiron 9300 and it appears to work correctly. Plug a battery in and it charges just fine. However when I turn the computer on it does not POST (or beep in any way at all). I turn on the power, the fans spin up, the HDD spins up, and then about 5 seconds later it all just shuts down. Ive tried taking the HDD and the RAM out to try and get some sort of beep code and i get nothing.

Im completely stuck, does anyone have any idea what the problem may be?

 

[Cali3350]

Hey guys i wanted to let you know i wasn't correct in my earlier post. The fans are NOT spinning. ONLY the HDD is making noise when the power button is pressed. I tried starting the laptop with it disassembled outside of the case in case the issue was a grounding contact or something. No go.
Appreciate any ideas