Can't boot up

Gudzilla said:

I'm helping my son with his desktop tower. He needed to get some specs off it for a class he's taking so we opened it up for a visual check. It was pretty dirty so he took a while dusting everything off. When we put it back together it wouldn't boot up. It has a Samsung 128gb SSD with the system (Windows and programs), and a WD 1tb blue HDD with the user accounts, then another HDD for his game data. I got into the BIOS, but the Samsung and WD drives weren't recognized. I opened it again and rerouted some of the SATA cables, but it wouldn't recognize the SSD at all.
I have a cable device to connect a drive to my laptop with USB. I scanned both disks and they came back with no errors and I'm looking for help as to what to do next.
Any ideas would be great.

Each drive has to have a data cable and a power cable.
The data cables go from the drives to the motherboard SATA ports.
And the power cables go from the drives to the power supply. (There will be 3 or 4 connectors on the drive end of the power cables. So one cable can power 3 or 4 drives, one connector for each drive).


When you get the data and power cables hooked up properly, the drives should show up in the BIOS.
When they show in the BIOS, the computer should then be able to boot.

The data cables and the power cables, have to be securely connected on BOTH ends.

Most likely a dislodged power or data cable. I'd replace the CR2032 BIOS battery whilst the cover is off since a PC can fail to boot when the battery voltage is low.