PC Build Failure - What did I do wrong?

Minimattt

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Nov 4, 2014
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So I tried to build a computer about a couple months back and it failed.. As it was so long ago, it's all dead and buried but I'm going to put a summary of what I did here to see if anyone can glean what I did wrong, so here goes...

I had the following parts:
Corsair CX500W PSU
MSI A78M-E35 Motherboard
AMD Athlon x4 760k CPU
MSI Radeon R7 260x GPU
WD Caviar Blue 1TB Hard Drive
Single 8gb Stick of Crucial Ballistix Sport Ram.

To do this build, I followed this YouTube tutorial https://www.youtube.com/watch?v=XsyxM_j3Y4U

I installed the Power supply first and let the cables hang out of the case while I set up the Mobo with CPU and RAM before screwing that into the case. It should be noted this was a Micro-ATX case so things were a little cramped while working...

Should also be noted that I didn't have an anti-static wrist strap but I didn't feel any static charges while working.

Installed Hard Drive and GPU and what not, then it came down to connecting the power cables. This is where I found things a little tricky and I was maybe a little heavy handed with some cables and was occasionally brushing prongs on the motherboard accidentally.

So once everything was connected, I put the machine up right, connected the moniter and turned it all on... Lights came on, fans were spinning, all seemed fine EXCEPT the machine didn't beep when turning on.

I also had no input on the monitor.. (I later discovered this was because I had the VGA cable in the Mobo slot instead of graphics card and didn't have a DVI cable). I pressed the restart button on the case several times before disconnecting everything and going down to my local tech shop.

The tech guy there connected the PC and tried turning it on but now the machine wouldn't even start.. He took out my PSU, put in one of his own and suddenly the machine turned on but STILL did not beep and wouldn't show anything on a monitor.

He concluded that the power supply blew and took everything on the mobo with it.. All that survived and has been tested and still working is the Hard Drive.. Luckily I got refunds for everything so was just a bummer that it was a failure.

Now I have decided I want to try my hand at tinkering again only this time, instead of having a completely fresh build, I'm going to be using a large case with plenty of airflow, a 600W power supply and 2x 4gb sticks of DDR3 RAM which I got from a friend. It all still works great.

I want to try again with the AMD 760k CPU and the A78M-E35 motherboard and the 260x GPU.

I'm just looking to see if anyone can tell me what I did wrong so that I don't repeat my mistakes. If you need any more info, just ask. Hope someone can shed some light!
 
Solution
Not sure if the PSU was defective, or what. On your average system the card requires you to have a 450 Watt power supply unit. I've calculated the wattage your system would take (I included 3x 120mm Fans, a CD-ROM, a CPU overclock to 4.3GHz with 1.4W of power, a Cooler Master V10 CPU Cooler) and still got 395W of consumption. I recommend XFX TS 550W 80+ bronze: http://pcpartpicker.com/part/xfx-power-supply-xfxts550w (you can get one for 70$ if you want modular)
Remember, CX500W is a below-average quality PSU and doesn't handles stress very well, but should still power you rig, unless you have crossfired.
There might be problems in other parts too, like the Motherboard.
Hard to say what went wrong. I suggest testing the board firstly outside the case, to make sure that all components do work and the system does POST. I'd also order a case speaker, if none available. It's helpful for troubleshooting in case of no POST.
 

n3onis

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Nov 5, 2014
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Not sure if the PSU was defective, or what. On your average system the card requires you to have a 450 Watt power supply unit. I've calculated the wattage your system would take (I included 3x 120mm Fans, a CD-ROM, a CPU overclock to 4.3GHz with 1.4W of power, a Cooler Master V10 CPU Cooler) and still got 395W of consumption. I recommend XFX TS 550W 80+ bronze: http://pcpartpicker.com/part/xfx-power-supply-xfxts550w (you can get one for 70$ if you want modular)
Remember, CX500W is a below-average quality PSU and doesn't handles stress very well, but should still power you rig, unless you have crossfired.
There might be problems in other parts too, like the Motherboard.
 
Solution