Dell Inspiron laptop has knock sound on startup

by Bob

Dell laptop makes a knock sound upon startup. Nothing displays on the screen. Lights indicating power on and the sound from the CD compartment can be heard upon startup. Hard drive was removed and appeared in good condition with heads parked and disks shiny and undamaged. Attempted to start the unit without the hard drive, connected and got the same knocking noise which sounds every two to three seconds apart but no display on the screen.

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Dell Inspiron laptop has knock sound on startup
by: Remus

Hello,

did you open the hard drive.


Dell Inspiron knock sound reply
by: A

Yes, opened the hard drive and noticed the head was parked properly and the disks were shiny and undamaged. Attempted to start laptop without the hard drive and it made the knocking noise without the hard drive connected and the screen remained black.

Dell Inspiron laptop has knock sound on startup
by: Remus

Hello,

It is not a very good thing that you opened the hard drive.
I hope dust did not make inside the HDD and you did not touch anything.

Please strip down the laptop i.e. disconnect DVD drive, leave only one module of memory, disconnect the keyboard etc. and try to power it on.

If this does not work then most likely it's a motherboard fault.

By the way, what Dell laptop model this is.

Dell Inspiron laptop knock reply
by: Superuser

I was very careful when I opened the hard drive. It only remained open for a couple of minutes. Nothing inside was touched. I plan on replacing the drive with a solid state if I can get laptop repaired. It is an Inspiron 17R-5721 model.

Dell laptop knock sound
by: Superuser

Stripped everything as directed. Still made sound. Motherboard is on order.

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