MacBook Pro A1260 - does not power on

The MacBook Pro does not power on.
When I press the power button shortly, the sleep indicator light goes on and goes off again (with the macbook going off) within less than a second.
When I press and hold the power button, the sleep indicator light goes on, stays on for about 4 seconds, then begins flashing quickly (4..5 times per second?) for a second or two and then goes off (together with the macbook going off).
What does the blinking mean?
I tried with the battery only.
I tried with power chord only (battery removed).
I tried with battery and power chord connected.
Each time the same result.
The macbook used to have an original power supply, but that broke down. Now I use a nonane replacement, which worked well for some months.
What can I do to fix it?
EDITT:
The screen remains black all the time - the macbook does not beep. I can hear the DVD drive start up - also I believe that I can hear the CPU fan.

sanjampet wrote:
You can try a SMC reset:Intel-based Macs: Resetting the System Management Controller (SMC)
Follow directions for the battery that applies to your machine (one you can remove yourself, or one you should not remove yourself)
3rd party power supplies have been know to cause issues.
I have a machine where I can remove the battery. I followed the SMC reset steps - no change.

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