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RE: PC Not starting hard drive problems
If there are no beeps and no BIOS startup screens, you've done something more than just mix up connections between drives and SATA ports.
Anyway, start by disconnecting all the drives, both SATA and power. See if you at least get the BIOS screens now. If you still don't, check all the connections you didn't intentionally touch, such as power to motherboard. Something could have come loose while you were working inside the computer. Reseat your graphics card and any other cards you may have.
If the above leads to success and you get video back, start reconnecting the drives one at a time. If, after reconnecting any of the drives it stops working again, try different power connectors to the drives (in case you are overloading a single rail) and also make sure the keyed SATA connections are not stripped and you are not somehow getting it plugged in backwards.
Aside from that, you will also have to get the SATA connections (drives to ports) right before it will boot Windows, but you should be getting BIOS POST screens and beeps regardless.
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