I just posted this one-star review to Amazon.com:
I bought my DV4-2045DX at Best Buy, on a whim. Soon after I got it, I headed to England for a family visit, and I decided to take this laptop along instead of my usual MacBook Air. Bad idea. Soon after we arrived, the machine began to malfunction. The symptoms were fairly consistent: I would close the lid (configured to “sleep”), and soon afterwards the logo would light up and the fan would come on. If the machine was unplugged, this would drain the battery in a few hours. Opening the lid did not wake the machine: the screen was blank, the keyboard unresponsive. More seriously, the power button wouldn’t work: holding it down for 5 or 10 seconds wouldn’t cause the machine to power down. The only way to stop it was to unplug it and remove the battery. After this, restarting was hit or miss. Usually, the machine would blink the CapsLock and NumLock lights in a pattern indicating “CPU failure”.
I struggled through the trip, and when I got home I called HP. They sent me a prepaid FedEx box to return the machine for service. I did so, and monitored the status of the service order on their website. For a couple of weeks it indicated that they were waiting for a part to repair it. Finally it was returned, two days ago. The service slip indicated that the problem had been reproduced during tests, and the CPU had been replaced.
I booted it up, loaded some software, and closed the lid. The problem returned in a few minutes: fan on, catatonic, wouldn’t power down, “CPU failure” after pulling the battery. I called HP, and they gave me a new service number. I’m still waiting for the next step.
Perhaps this is just a lemon, but the “waiting for a part” is suspicious. It suggests that this may be a common problem Hopefully HP will replace it this time. (I wouldn’t mind a refund, but that may be too much to hope for.)