CPU fan error / can't enter Bios

OK here are the circumstances. I had a fully functional desktop. HP p6510Y is the model. Opened it up to clean it, removed the cpu fan and cleaned all that out. Decided while I was there to repaste the cpu, and put in a better PSU. Anyway once all back together I now get the CPU fan error and it shuts down the computer. I can't seem to get to the bios to change the fan settings. There is only the option for usb keyboards on this unit. I have tried every usb port while mashing f10, (also tried f1, f8, and delete) with no luck. Put the old PSU back in just in case, same there. Tried the case fan into the cpu fan header, same thing. Any insight would be appreciated.

Post was last edited on February 18, 2019 12:33 PM PST

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Let's change that model number.
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Thanks, corrected the model. I finally got into the bios somehow by pressing f2 and then waiting for the slower startup to allow me to press f10....this bios doesn't have a hardware monitor section to turn off the cpu fan Now I am unsure of what to do, but at the very least I can get to windows through F2 now.

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If you can't fix the fan.
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Fan itself works

The fan is working. After doing the f2 thing and getting to windows the fan is running full blast. I have a feeling this is something physical on the board itself where the signal isn't getting where it needs to go. Cold solder joint maybe?

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Or the fan speed signal from the fan

Is broken. This is a very very common issue with HP, Dell, others. I use an Oscilloscope to see what it is. However we're an engineering firm so we have that gear. Shops will pop in a new CPU fan and if that fails change the motherboard if there is no disable.

Home users usually hobble along with F2 and as to CPU speed you can add for very little a fan speed controller.

Post was last edited on February 18, 2019 1:20 PM PST

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Thanks for the advice.

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