@vinylcake from the service manual for your computer:
LED 1 and LED 2 Blinking Power Button Amber
Problem Description A possible system board failure has occurred.
• Disconnect all internal and external peripherals, and re-start the computer. If the computer boots, add the
peripheral cards back one by one until you find the bad one.
• If the problem persists, the system board is faulty.
LED 1 and LED 2 Blinking Power Button OFF
You do want to make sure that you properly inserted all your cards and that everything is connected. Since you did not tell us to what extend you cleaned your computer and exactly what you did, it will be difficult to pinpoint this.