Troubleshooting potentially fried laptop motherboard

[priit.lehis]

Hey guys,


So my laptops internal power cord broke for like a third time, so I opened her up and decided to solder the cord back together. Unfortunately, I soldered the DC power cord wrong way around (black wire where the red wire should go and so on). Then, I put the laptop back together, connected the charger and tried to boot it up. I realized immediately that I had made a mistake, because the charger started beeping. Then I opened the laptop up again and resoldered the wires.
This time the laptop booted up, but it went straight to BIOS, and my MSATA SSD and HDD weren't showing up. So how fucked am I?
Can I do something, is there any troubleshooting steps I should do or did I fry my laptop completely?

 

[rocktalkrock]

Set the BIOS to default, re-boot and see what happens. It could have messed up your settings.