Did you try re-seating the ram? I repair and resell computers. The most common problem with laptops is the memory modules become unseated from moving them around. The screen won't light on most of them if the ram becomes unseated. Just remove the ram cover on the bottom, remove the modules and reinstall them. A bad module will do the same thing. If reseating them doesn't work, try removing one and then the other to see if you have a bad module.
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I assume the power LED is on when you boot up the laptop and the power adapter is OK.
If I understand you, the RAM module is in memory slot A and not in slot B. If not the RAM module needs to be in slot A.
When a laptop doesn't the RAM module may only needs re-seating or the RAM module is faulty. Re-seat the RAM module, and if this then take the RAM module and get it tested at your friendly computer shop.
If it doesn't respond at all with no ram or hdd, it is likely that the board is in fact dead.....sorry. When you say you found a broken pin, I assume you mean one of the contacts from the power jack to the main board had a cracked solder joint and you resoldered it. If this is the case, try disconnecting and reconnecting the connector from the lcd panel to the mainboard. It may just not be making contact. Also, if you boot up with the hd installed, do you see the hd activity led flashing like at a normal boot? If not, sounds like a dead board. Try pulling the optical drive too if you haven't already. Try connecting to an external monitor too.
I had the same problem, replaced the hard drive and problem went away. The hard drive developed bad boot sectors after downloading XP service pack 3. I found out later it isn't compatable with the dell I have. Hope this helps. Good luck!!
it could be that the ports where you plug in the charger is damaged. if you have an identical or a known good battery that is charged, try to install that and check if it works. you need a motherboard replacement if the system works with a charged battery.