I have a desktop computer. Whenever I turn it on, the screen remains black for about 5 minutes before showing me the desktop. It started doing it a few days ago and I haven't installed anything new recently.
I know that the computer is ready to use because I can even see the desktop on my mobile phone using TeamViewer while the screen is black...
So your computer actually works after the 5 minute wait for the desktop to show.
You may be confronted with a malware.
To help you and prescribe the remedy, I must make a diagnostic and to do so, I require a report.
1. Open this link and download ZHPDiag :
https://www.nicolascoolman.com/fr/download/zhpdiag/ (Don't be alarmed is the site is in French, it sometimes happens, the tool will take your system language and allow the download if you get a warning message, ignore it.) Click on the download button
2. Save the file on your Desktop.
3. Double click on ZHPDiag.exe and follow the installation instructions.
(For Vista, Win 7 and 8 users, click right to ensure you execute with admin right)
4. Double click on the short cut ZHPDiag on your Destktop.
5 Click on scan
Wait for the tool to finished (maybe a long time)
Rapport de ZHPFix 2015.10.19.9 par Nicolas Coolman, Update du 19/10/2015
Fichier d'export Registre :
Run by Allen at 2016-10-25 7:46:19 AM
High Elevated Privileges : OK
Windows 8 Business Edition, 64-bit Service Pack 1 (10586)
Everything was working fine yesterday. I rebooted my computer a few times to make sure it was alright and it was. But this morning I get that black screen again for a few minutes while the computer is fully loaded.