Power button lights up  for a few seconds but does not power up

Hello
my computer froze up so i shut it down via the power button but now it does not power on when pressing the power button the button lights up but as soon I let go the light goes out and nothing happens not noise form the computer
anybody can help.

Hi, racb -
Try resetting the PMU - Article #HT1939 - Resetting CUDA/PMU
Also, it may be time to replace the internal battery. Those batteries have an expected life of about 4 to 5 years; leaving the machine disconnected from live power regularly or for an extended period can reduce that time a lot. You can get a replacement at places like RadioShack for about US$18, cheaper on-line.

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