MacBook Pro 2011 doesn't turn on. Completely dead.

I was playing League of Legends in my MacBook Pro Late 2011 A1278 when it suddenly turned off. No messages, no sounds, just turned off.

When MagSafe is connected, the lateral lights that indicates battery charge turn on normally. If MagSafe is disconnected they don't work at all. If the battery is disconnected but MagSafe connected, pressing the button makes the first light blink for a few seconds; pressing it a second time makes all the lights flash for a few seconds.

I opened it, and checked all the connections. Then I:

• Removed one RAM memory and tried to turn on.

• Removed the other RAM memory (and placed the first one) and tried to turn on.

• Disconnected battery, disconnected MagSafe, connected MagSafe again and connected battery, and tried to turn on.

• Disconnected MagSafe, disconnected battery, connected MagSafe and tried to turn on.

• Danced an apache dance to the moon and tried to turn on.

I just wanna die. Thank you.