Inspiron 570 - Dell Ethernet Card Network Adapter

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From the looks of the mobos this is a possibility. One uses AMD processor, while the other is Intel. The 570 board appears to be small form factor. I make no guarantees though.

What's the reason for using a different model? I saw a lot of each for sale on Amazon

If you don't know that, then take it to a computer shop.

Optical drive failed the Spindle test.

Make sure the SATA power cable, and SATA data cable; are tight to the optical drive. Still no? Replace optical drive.

http://www.dell.com/support/troubleshooting/us/en/19/Product/inspiron-570

Dell Inspiron 560/570 Service Manual (1031KB)

Regards,
joecoolvette

Try to solder.

Sometimes its just a connection problem and sometimes it is more. Try a simple step of removing all connections(power and other cables on your CPU). Then press the power button and hold for 10 seconds. Connect everything back on and see if it works. ;)

You do not have a physical switch for the wireless. You can turn it on and off through the Dell Wireless Utility.

cannot start my dell inspiron 570 desk top computer with the power button in front of computer

If you look on the back of the PC, there should be a yellowish jack in the back. That is where you insert the connector for the speakers to.