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Consider 12v power supply
As everyone here seems to have done, I have used a 100W invertor to supply my lap top via its 240v power supply and it works fine. So itlooks like your invertor is faulty.
Before you fork out for a new invertor though, consider buying a 12v power supply to replace the one from your laptop manufacturer. There are several makes on the market - I use Kensington.
The box will boost the 12v supply up to 19v or so and provide all the regulation, overload protection, thermal protection etc that your laptop power supply does.
The difference is that by not boosting 12v up to line voltage and then letting your laptop brick bring it back down to 19v, you will waste far less precious amp hours in heating up bricks. My invertor almost glows and the 240v HP power supply gets seriously warm. The Kensington brick just gets gently warm.