If your Compaq Presario CQ40-626AU is suffering one of these issues like wifi and bluetooth not working, sound stopped working, blue screen error, black screen or screen flickering, in most cases, they are probably caused by outdated, broken or missing Compaq Presario CQ40-626AU drivers. To clear out these driver related issues, you need to download and update HP Compaq Presario CQ40-626AU drivers for Windows 7.
Compaq CQ
HP Compaq Presario CQ45-402TU Drivers For Windows 7 / 8.1 /10 64-bit
If there is something wrong with your HP Compaq Presario CQ45-402TU drivers which could result in no sound, no Wi-Fi available, touchpad stops responding, USB device malfunctioned, etc. To avoid the aforementioned computer issues, you’d better regularly download and update Compaq Presario CQ45-402TU drivers for Windows 7.