03-20-2017 04:54 PM
HP z640 stuck on WHITE SCREEN after HP logo during startup
03-20-2017 05:45 PM
Your computer: http://www8.hp.com/h20195/v2/GetPDF.aspx/c04400040.pdf
1. If you connect the monitor to a different desktop or laptop, does it work correctly?
2. If you connect a different monitor to your computer, does it work correctly?
3. After the initial start-up screens, does the disk-activity lamp (on your computer) flicker, to indicate that the disk-drive is being accessed?
4. If you reboot, and select "HP Diagnostics", can you run the tests for the RAM and for the disk-drive?