17" MacBook Pro won't run on AC power

Ok, this is a unique situation and I have searched the forums and can't find an answer, my early MacBook pro will not run on straight AC power, it will power up and run on battery power and the battery WILL charge while the machine is powered OFF but will not charge while the machine is on, so anybody have a solution?
Will run on battery power, will not run with battery removed on AC Only, battery will charge with AC adapter ONLY when machine is powered down, will NOT charge when machine is on.
Thanks for your help

Ok, booted into safe mode still same results , won't run on AC power, turn unit off light turns orange on power adapter and battery charges as normal, AC adapter plugged in light is green not charging while unit in on and will not run with battery removed, if I remove MagSafe it intermittently turns orange then back to green....Still perplexed as machine knows AC adapters connected and will charge but will not power or charge when unit is on.

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Dont worry,this is the nature of Macbook Pros or Macbooks.When we are using our mac,the power consumption is not constant but fluctuates instead.At certain moments,the power consumption will go beyond what the AC adapter can supply...when this happens,the battery will have to provide extra power to cater those needs.
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Firmware Version: 0102
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dmwingon wrote:
purchased off eBay from a highly-rated seller,
reset both the SMC a
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17" MacBook Pro won't run on AC power

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