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Have you ensured you have the drivers for the projector? As you are using a cable, it may be as easy as going into your Device Manager and checking for any warning icons...typically under the Monitors, and Display Adapters. Connect the cables, and open your Device Manager, then click to scan for new Hardware. if any of the drivers regarding display result in the warning select to update the drivers. Allow it to do so automatically, as I am not certain is HP has the driver on their website: HP Drivers Downloads It may not list your exact device, but many drivers work for multiple models.
My dumb question is have you checked the settings in windows? I have my laptop setup so it dims by 30% or so when off the power cord. You would need to go to the control panel and then, depending on what version of windows, display or power options.
If they are setup high, it sounds like you have done everything you can do, contact HP tech support at 800-474-6836
Light flashes cause battery is critical low.
Try to unplug and then plug in cord again, until front lamp lites on.
If you continue to have this problem, post and I will explain how I solved mine.
Well I had problem that sometimes after plug in or out, battery goes from 100% to 3%, I thought it was battery or adapter, but it was software. I did ask HP about it, they said they had customers with such problem.
You might have same problem.