[SOLVED] Computer won't start, can't diagnose problem.

[AiNaKa]

My prebuilt PC recently stopped working and so I assumed it was a motherboard outage (The fan spun wildly as the PC refused to start up). I bought a new motherboard and transferred all parts to it. Since then PC, still refuses to start up, but the fan problem appears to have been fixed. I've tried different combinations of RAM, a new RAM stick entirely, 2 different CPUs, and even messing with the hard drives, and the result hasn't changed. I do indeed get a beep code when there is no RAM present, and oddly enough, the brand new stick of RAM I bought gives me one too. The motherboard and PSU are both brand new, the CPU, one of my hard drives, and 2 sticks of RAM are no more than a year old, and 2 more of my sticks of RAM, and another hard drive are approximately over 4 years old.

As for the actual problem, it appears nothing works when I attempt to start up my computer. I'm offered a blank screen, my monitor doesn't even detect a signal, and none of my usb peripherals turn on. Yes, I have remounted the CMOS battery and tried different VGA cables and even a different monitor, the result does not change. I can't figure out the problem for the life of me, and neither can my friends, I'd like some advice.

The parts I'm using:
Motherboard: Dell Optiplex s1155
CPU: Intel Core i5-7600K
PSU: EVGA 500W Gold
RAM: (specs mostly unkown) 4 sticks, 14 GB total, DDR3
if any more part information is needed, just ask

 

[Grobe]

Did you use a PCIe GPU or the onboard one?

 

[AiNaKa]

Did you use a PCIe GPU or the onboard one?

onboard GPU. Though, I still feel like graphics isn't the issue here, considering the fact that no peripherals work when I try and turn on my PC.

 

[Grobe]

Have you ever tried to switch to another monitor ?

 

[Calvin7]

With this kind of memory setup, you can expect your system to run like it does.
RAM: (specs mostly unkown) 4 sticks, 14 GB total, DDR3
if any more part information is needed, just ask

 

[punkncat]

-snip-

Edit- Um, it appears that this is a motherboard for "8 series chipset" IE 4th gen Intel. How would you have even socketed a 7th gen processor?

This is one of the things I hate about Dell products when it goes to replacement. I have found that motherboard with the same, or Dell's model number on three different sites and each one of them is for an entirely different generation of CPU.

Is this inside a 9020 chassis?
If so, see the first edit.

Keep in mind that whatever generation it turns out to be that you should have some adapter plugs for your PSU to (proprietary) motherboard connections.