HP DV7-3085dx won't power up, seems the battery and charging is ok.. possible mother board problem?

Hi I recently received an HP DV7-3085dx from a friend of mine since he hadn't been using it for a while.
So, when I tried to turn it on for the first time, the power button wouldn't work, or the lap top itself wouldn't power on.
When I plug in the charger, AC adapter light turns on, and when I connect the battery, both the battery light and the AC light turns on fine.
However, there's no fan, or any light flashing when I press the power button as if it's dead.
I've searched and tried:
1. hard reset - pressing on the power button for a minute without any attachement and so on
2. reseating ram and CMOS battery
3. cleaning heatsink and re-applying thermal compound.
4. tried turning on the laptop without hard drive.
However, none of those would solve the problem.
Could it be the faulty motherboard, fan or heatsink?
Or, does battery light on means the motherboard is safe, at least?
By the way, it seems like the battery charges just fine as after a while on an AC, the battery light turns off(signaling that it's fully charged)

Hello coolhair50, welcome to the HP Forums.
I see that you've acquired your Notebook from a friend, that you're trying to get it to turn on and start up. That only the batter and charger appear to be working as the Notebook will not turn on. I will try to assist you with this.
You're on the correct path, the issue does appear to be hardware related from what you've attempted so far. The battery and charger appear to be fine.
What I would suggest starting with is this document: Troubleshooting Black Screen Displays with No Error Messages During Startup or Boot. It will guide you through testing the memory and hard drive. If all of that tests ok, then you're most likely looking at a motherboard issue.
You have a few options at that point. The first would be callling support to see what they could offer. HP Technical Support, North America 1-800-474-6836. For all other regions click here.
The second would depend on your own personal knowledge of Notebooks, but you could use the Maintenance and Service guide to look up possible compatible parts and how to replace them.
Please let me know how everything goes for you.
Thank you for posting on the HP Forums.
I worked on behalf of HP.

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In daily use: R60F, R500F, T61, T410
Collecting dust: T60
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Quote from: BOSSKILLER on 07-February-08, 13:24:04
Do you use system stock parameters?(No OC)
Check CPU cooling system.
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