Pc won't turn on, gives 3 Beeps.

Helper

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Hello,
I was trying to install Windows through a usb on a PC. It had an installation of Windows 8 already and worked flawlessly. I had then tried accessing the BIOS and I turned off Legacy boot. Ever since then, the PC shows no display. It would first give a few beeping sounds (I don't know the exact number), and outputs such as the mouse, keyboard etc had lit up. Now, however, it gives 3 BEEPS and the keyboard and mouse do not work. In both occasions, there would be no display available. Specs are as follows: Intel i5 2300, 8gb of Ram, Intel DH61WW, 550W PSU
What I've tried: Making sure nothing is loose (ie wires), clearing any dust, disconnecting everything but the power.
Any ideas? From what I've researched, 3 Beeps indicates a ram or motherboard issue. The CPU, GPU, PSU and hard drives seem to be running, however. The light on the motherboard also turns on.
Forgive me if I have failed to give adequate details. I sincerely hope that the problem is unrelated to any hardware damage. Thank you.
 

My Computer

System One

  • OS
    Windows 8
Reset the BIOS. Your MB manual will tell you how. Sounds like you changed something you should not have when you made the change.
 

My Computer

System One

  • OS
    WIN8.1/Server 2012 R2/Win 7 Ultimate
    Computer type
    PC/Desktop
    CPU
    Intel Core i7-4960X Extreme 3.6 GHz, Socket 2011, Ivy Bridge-E
    Motherboard
    Asus P9X79 Deluxe
    Memory
    32GB Corsair Dominator Platinum CMD16GX3M2A1866C
    Graphics Card(s)
    Gigabyte GV-N78TOC-3GD, GeForce GTX 780 Ti
    Monitor(s) Displays
    HP LP2475w
    Screen Resolution
    1920x1200
    Hard Drives
    2x240GB Sandisk SSD, 2x3TB Segate 7200RPM
    PSU
    1500w Spider
    Case
    CoolerMaster HAF X
    Cooling
    Corsair Hydro Series H105
3 short beeps = vga issue, continuous long beeps = Ram issue
 

My Computer

System One

  • OS
    Windows 8.1 Pro x64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Custom Build
    CPU
    Intel Core i5 4430 @ 3.0 GHZ
    Motherboard
    Asus H87-PLUS
    Memory
    8 GB GDDR3
    Graphics Card(s)
    Asus R9 270 OC 2 GB
    Sound Card
    Builtin AMD Hight Defination Audio Controller
    Monitor(s) Displays
    ASUS MS228H 21.5" Wide LED Monitor
    Screen Resolution
    1920x1080
    Hard Drives
    1 TB SATA Seagate
    PSU
    Seasonic 500w PSU
    Case
    Orange
    Cooling
    None
    Keyboard
    A4Tech Usb
    Mouse
    A4Tech Usb
    Internet Speed
    3G via Smartphone (Mobilink)
    Browser
    Mozilla Firefox, Chrome
    Antivirus
    Kaspersky Internet Security 2015
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