Fan of D4T - 1500 HP continuous switching speed between hi and lo

My laptop is switching speed between lo and hi when the battery and the AC adapter / CC are connected.  If disconnected the unit is operating normally.  It does not matter if I have a window open, 3, 6...   I replaced the original battery (2009) with a battery 8800mAh to increase time between charges about 6 months ago.  The battery has a bump to raise the notebook off the surface, it's on and improve the flow of air.  Everything was fine until a few days ago.  The Unit feels not hot when the bike fan starts but stops immediately after disconnecting the adapter or pulling on the battery.  Any thoughts?  Thank you.

Thank you for visiting the Forums HP's Support and welcome. I read your thread on your HP Pavilion dv4t-1500 Notebook and having issues with the fan switch to salvation and weak. Try perform a reset. When you perform a hard reset note remove all USB devices and remove cards memory card reader location. Disconnect all non-essential devices. If that doesn't help try to turn on the computer, on which you begin to press F11 repeatedly until the menu opens. You can do a System Restore. System Restore will return the computer before this fan problem began.

Here is a link to test and calibrate the battery. Here is a link to test the ac adapter.

If everything fails, you can try to restore the default BIOS. This would force the machine to look at what the material is on the laptop.

Hope it will be useful.

Thank you.

Tags: Notebooks

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