Hi everyone, I have encountered an odd power problem on my Lenovo Y580, running Windows 7 Ultimate, and need your help. I have tried to do battery gauge reset, it was done last night, with the laptop plugged in the entire time. Once the battery was powered down, though, the machine stayed off. I could not power back on the Y580 afterwards. When I removed the battery and tried to turn on the computer using the AC power supply only, it also would not turn on. Eventually I was able to power up the computer by disconnecting the AC power from the computer, disconnecting the AC power from the wall, removing the battery, letting the computer rest for a minute, then plugging in the AC power, but leaving the battery out and pressing the on button. If I then power down the computer, and attempt to replace the battery, the computer will not turn on and I have to repeat the process mentioned above. If the computer is running on AC power and I plug in the battery, it will charge. However, if I disconnect the AC power during charging and reconnect it, the battery will no longer charge, and the computer will shut down after the battery runs out, even though the AC power is connected the entire time. The computer cannot be powered on again then until I repeat the above procedure. What is the problem and how do I fix it? I have never had so much trouble with a laptop, its battery, and its power supply as with the Y580. I have tried the trick with pushing power button for 30 seconds, it doesnt help me. I heard that this problem is somehow connected with a motherboard. If so, do yo know how much will it cost to repair it?