So the other day I ran a diagnostic on my Precision 5540 laptop to check the battery, however as soon I started running the test, it gave me a message stating that the hard drive is not installed with error code 0155. However the computer boots up just fine, I'm typing the message on it right now. I would have never known unless I ran that diagnostic.

However I ran support assist once the computer was loaded and it says everything is fine, I downloaded seagates hard drive program as well and it says its fine. I updated the bios as well, however I still get the message when I run a diagnostic. Has anyone run into this?

XPS 15 9550- i7 256GB FHD 8GB

Keyboard is much better than my XPS 13! The keys are more solid and I don't have an issue with the space bar.

Problem during initial boot: The XPS 15 initially booted to a Dell SupportAssist screen with the error: Hard-drive not installed.

We could not press continue because the track-pad wouldn't respond to touch. A forced power off/cold boot allowed us to use the track-pad to click through the screen. This initial impression at first boot was poor. Windows launched successfully afterwards. Still no cause found.

BSOD: next we browsed the web using edge for 15 minutes. The screen flickered and we were presented with a BSOD - video_scheduler_internal_error. Oh shoot, Windows 10 crashed. After a clean boot we ran win10 updates. BSOD has not recurred after a few hours of use.

Screen - Comparing the FHD screen on the new XPS 15 to my daily driver XPS 13 9343 FHD; The XPS 15's white balance is on the warmer side. The XPS 13's white's were more (to me) neutral. Whites appear to have a slight yellow tinge. Could be subjective due to direct comparison however.

Power button - the button is not slightly recessed as the XPS 13. The button is ever so slightly hitched/raised on the left side of the button. Since it is ever so slightly raised, it is easy to accidentally press the power button, especially if you press near the left side of the button, as it is not completely flush with the surrounding surface. This irked me some.

Sound problem- MaxxAudio was preset to MaxSense. Music was clipping at volumes above 70% and parts of the chassis resonated audibly when listening to Google Play Music. Changing the preset to 'Music' seems to have mitigated the issue ~90%. Perhaps a bad preset from the factory for most people.

Diagnostics issue - Ran a dell diagnostic, because who wouldn't after a initial hard drive error and a BSOD right? The following was immediately received before testing: "Error in dell diagnostics: "ePSA 4302.10 - Warning: Hard Drive - Not installed. Continue Testing?"

We pressed "yes" and the diagnostic completes with the following: "One or more errors were detected." When we press "ok" however, the diagnostics returns to its beginning with no further details.

Yet the computer boots fine despite the above error.