Hello, I have a problem with my HP Probook 6460B. The laptop has failed to power on. It has no battery and I have been using it directly on AC power Adapter. Now when I connect the adapter, the orange light (which usually indicates critical battery level) starts blinking and the laptop won't power on even when I press the power button. How can I go about this? I have tried to connect the adapter to another laptop and it's working fine but when I tried using another adapter on this laptop, it still indicates the same light and won't start.
Sorry for the bad news, but when a laptop does not even power on, you have few if any options for getting it working again on your own.
To determine the cause with hardware failures, you have to be able run diagnostics. We have no way of accessing your PC from here, so we can not do that for you. You have to do it yourself. You do this by pressing the Esc key repeatedly when rebooting and then, when the HP Startup Menu appears, selecting Diagnostics (usually F2) and letting it run.
But if it is NOT possible to run diagnostics, then there is NOTHING more you can do by yourself -- and there is NOTHING we can do.
You will need to have the PC physically examined in a service facility by folks that can run their own diagnostics to determine what is wrong with it. And the problem with that is, while HP does do repair work of some sorts on PCs still under warranty, they generally do NOT do repair work on PCs out of warranty because they are not a general purpose repair facility. You would have to contact them in advance to see (1) if they are willing to work on it, and (2) if they will provide you any kind of repair cost estimate.
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