It's not clear to me that HP is aware that even previous 90 Watt power supplies won't function even as smart adapters (not charging the battery in other words but simply supplying power to the laptop). This means that only the massive 'Brick' power supply that comes with the laptop can be used. This is ridiculous and wasteful. If you are not running games, the system should recognize earlier generation power supplies as adequate to function as smart adapters. It's another example of HP not sweating the details.
You're kidding right? You think that this cut and paste boilerplate answers the question? This is stuff that a beginner knows.
Please go back and reread the question. Additionally, it appears that you are grossly unfamiliar with the Omen 17. Perhaps you should familiarize yourself before you respond to the next technical question about it.
The issue is that previous 'full' power supplies, 120 watts in other words, and from HP and not third parties now won't even run as smart adapters - let alone charge the battery while the system is running.
The system firmware has a paranoid approach to the 'vetting' of power supplies. If you're not doing heavy-duty gaming I doubt that the system draws more than 30 W. The notion that 120 Watt power supply therefore won't do anything in these low-power conditions can only be described as totally absurd, and frankly it's part of the evidence that once again HP has not sweated the details. Not only will that 120 Watt power supply not charge the battery, it won't even supply power in any fashion to the laptop, unless the laptop is powered down. In other words it won't even function as a travel adapter.
Just in case you're wondering, I've built about six computer systems, have owned dozens and dozens of them, and I've never seen anything like this. It's bizarre but then again it's HP. The closest thing to it is Dell's proprietary refusal to accept anything but a Dell branded power supply, even if it's the right wattage, voltage and connector.