Unplug the system, remove the base cover and disconnect the main battery from the system board. Hold the power button for 30 sec.  Remove and reinstall the drive(s).. Service manual is here: [URL] Reconnect the battery, replace the base cover, power up and boot to the Dell diagnostics (F12 a few times are powerup).  If the error is gone, you're set.  If not, and the system is under warranty, record BOTH the error and validation code and contact Dell for a warranty replacement of the drive. If you're out of warranty, you'll need to replace the drive at your expense.
Hello, I have a problem with my Dell PC. When I turn on it shows me a message says, "The hard drive not installed...." with a QR and error code: 2000-0155, Validation code :99651. And it makes strange beeps . Any suggestions?
Inspiron 5502, error, hard drive not installed