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Find the best Mechanical Keyboard in Pakistan. Download Compaq Presario CQ42 Quick Launch Buttons Driver v.6.50.7.1 REV: A 
This application enables menu control of various bezel buttons, such as volume, internal/external display, and mute on/off HotKeys and Docked Events.
keyboard to be programmed for the supported notebook/laptop models and operating systems. Original New HP Pavilion DV7 Series Laptop Keyboard - UK Layout Bronze,Coffee New UK Layout Keyboard for LENOVO IBM Thinkpad T430i T530i X230i Series 0C02023 04X1344: 10. Original New HP Compaq Presario CQ60 Series Laptop Keyboard - UK Layout: 09. On some Compaq laptops - the 1700 comes to mind - that procedure is the *only* way to reset the BIOS. 
Turn laptop on and hold F10 key during POST.
Compaq Presario CQ57 Series Replacement Laptop Keys This laptop key will work for ALL models of Compaq CQ57, as long as the model number starts with CQ57, this is the correct keyboard key., this is the correct keyboard key, Compaq used 4. This service also exists in Windows 7, 8, Vista and XP. I8042 Keyboard and PS/2 Mouse Port Driver - Windows 10 Service i8042 Port Driver by Microsoft Corporation. If you don't wish to DIY, then take it to a reputable repair center and ask for a "Quote"as to the costings and go from there, is my best professional advise. The only fix is replacement of the entire keyboard, they are quite cheap and easy to replace, of course one must check first the connector where it mates to the main board, and see if this is firm and OK, if it is OK then it is not that, and then it will be the keyboard. sometimes the keyboard connector can become dislodged a little and may make poor or intermittent contact on certain "lines" and this to will cause this, symptom too, so this must be checked first. Hi I have seen this problem many many times before in my shop, it is the Keyboard matrix,or connection, often the matrix goes open circuit,and this stops that row,or group, of keys for responding the way it should, eventually it will fail all together.
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