Lenovo R61 turns off

[someone]

Hi,
yesterday i was replacing a lenovo r61 fan due to a fan error problem. While i replaced the fan and tried to open the laptop(was connected only with AC adapter), laptop opened and then it after the thinkpad screen it turned off, also AC adapter green light turned off and i could not open the laptop. I tried the battery and the same thing happens. It's like the laptop does not have any current. Although if i disconnect AC adapter from laptop and enter it again, the green light of AC adapter works and i have the same problem. Any ideas?

I tried the classic things removing adapter and pressing power button for 20 seconds but it did not help. removing the ram gives the proper beep messages.