Computer won't boot after motherboard, graphics card, and cpu upgrade.

[mastertkb]

Im new to upgrading and I just attempted to upgrade my prebuilt gaming rig, and it wont boot anymore and Im a damsel in distress needing some help to see if i got anything wrong. Also please help with anything you have.

The prebuilt rig i tried upgrading is the CyberpowerPC Gamer Ultra 2098 (http://www.newegg.com/Product/Product.aspx?Item=N82E16883229285)
quick specs:
cpu: AMD FX-Series FX-4300 (3.80GHz)
ram: 8GB DDR3
hdd: 500GB SATA II 3.0Gb/s 7200RPM
Graphics Card: AMD Radeon R7 240 2GB
PSU: sketchy (brandless) 500w

I bought this computer a while back and I decided to upgrade the motherboard, cpu, and graphics card.
cpu: AMD FX-8320 Vishera 8-Core 3.5GHz (4.0GHz Turbo) (http://www.newegg.com/Product/Product.aspx?Item=N82E16819113285)
Motherboard: GIGABYTE GA-990FXA-UD3 AM3+ AMD 990FX (http://www.newegg.com/Product/Product.aspx?Item=N82E16813128514)
Graphics Card: GIGABYTE GV-R927XOC-4GD Radeon R9 270X 4GB (http://www.newegg.com/Product/Product.aspx?Item=N82E16814125496)

While Upgrading it seemed that I didn't have all the cables for the motherboard for example i only had one connector for usb while the motherboard had 3 usb connector. heres a potato quality photo from my phone for your expert evaluation

On the bottom you see how empty the connectors are especially the area with the speaker connector. As I only had the speaker, hdd l.e.d., reset switch, power switch wires for me to hook up. But I did have the 12v and 24 pin connector for me to hook up and i read thats important to have so i guess i have the major cables from my power supply.

After I set up my motherboard i hooked up the graphics card and i was set at least i thought. I reconnected everything I booted up the system and for a quick second my fans started then shut off. I then remembered the graphics card had a external power cords i thought wasnt necessary. (heres an image of them)

The booklet the card came with said they arrn't necessary but i think they need to be hooked up but i cant find any connectors that seem to fit those connectors except for one but it has four female prong slots while the card power cable only has 3 and even if the card card can use it I dont have enough.
(heres a image of them)

Finally I checked with a bunch of psu calculators
PSU calculators:
http://extreme.outervision.com/psucalculatorlite.jsp

http://www.coolermaster.outervision.com/

http://support.asus.com/powersupply.aspx

and they said 500w of power was enough for the build. So I have no idea of what to do for my computer to live again. Please help me with any info or experience you have for it would be much appreciated.

 

[TheElectronicGeek1]

maybe you can try booting with the old parts unless you don't have them or cant put them back in.

 

[TheElectronicGeek1]

otherwise i don't know.

 

[shortstuff_mt]

The GPU requires both 6-pin PCI-E power connectors to run. Your cheap no-name PSU likely doesn't have two 6-pin power connectors because it isn't up to the challenge of powering the system with the upgrades. I would replace the PSU with a high quality unit ASAP. A cheap PSU is a quick way to turn a collection of expensive components into paperweights. The XFX TS Series P1550SXXB9 550W PSU is a high quality unit for a great price.

Edit: You can also use the troubleshooting checklist in my signature to troubleshoot the problem.

 

[hans_pcguy]

You are going to have to disassemble it and start over. You really should understand what and where you are plugging everything in to. After you disassemble it, start by just installing enough stuff to get it to post, for example one stick of ram, no hard drive or dvd, you get the idea. Add one new component at a time, if you add one and it quits working you know that you have either put it in wrong or it is faulty. Good luck.