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The issues you are describing are indicative of either a ram failure, or a power supply failure. What I would do first is open the machine and remove both of the ram chips.. Then press and hold power for 30 seconds and then insert one ram chip.. Then, try to turn it on.
If that doesnt work, remove the first ram chip, insert the second, and then try to turn it on. If it still wont blink or show any signs of life, then its more likely your power supply that needs to be replaced. Here is a video that will help you open the machine and remove the ram.
Let me know if the ram swap helps, or if the issue persists.
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