オリジナル投稿者： Philip Le Riche ,
It's most likely either the battery or the mains adapter. Remove the battery and try running on the mains adapter only, then try disconnecting the mains adapter and running it on the battery alone. If it fails with one but not the other, that's your answer, but if it powers off as you describe in both cases, then it's something within the laptop itself. Google for "HP Pavilion dv4t disassembly" and you'll find several guides. It could be that the heat sink has come away from the processor chip which as a consequence is almost instantly overheating and automatically shutting down. In that case you'll need to clean off and reapply the heatsink paste and refit the heatsink. Again, Google should be able to find you a guide of video showing you how to do that.