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It stays on with Battery? Has the AC jack been damaged due to pulling on the cord while plugged in? Have you tried another cord/charger with the EXACT same power specs? Does the cord/charger charge the Battery? Charge LED lights? It sounds like a Graphics Adapter? If you connect to a external monitor is it the same. Your question/statement indicates multiple issues. 1 , Power, 2, Graphics. Can you clarify "color blank"?
firstly check your power voltae from your transfomer, to the laptop...if its normal..then try to get the same type of battery and check if it is a problem...if all are doing fine..then your cmos battery , change it..last options are with the memory ram, and processors...step by step..it should solve your problem
Try to shutdown, remove battery, remove AC plug, Press and Hold Power button for 30 seconds, replace battery and AC adapter and test.
do you hear windows booting ( the startup sound) after a few minutes, if so there may be a monitor hardware problem
Definitely try without the battery. These models are known to have a "short" problem, usually with the palm rest, which causes this failure, although it usually is more sporatic, and doesn't happen 100% of the time.
Also, can you remove all but 1 piece of memory.
Good luck, and let us know what happens.