Computer not posting and not turning on

[Danielatheer]

Please for the love of god fix my issue so when i unplugged my hp-pavilion-p6200-desktop-pc-series for 1 year then plugged it back in i noticed issues and i thought it was the power supply going faulty but i listened and i heard power inside but it never turned on i tried looking on youtube but nothing solved my problem and i tried Checking for missing components but everything was fine and I Checked my motherboard and it was receiving power so i do not know what is going on because 1 year ago it was working and i need some help I have a hp-pavilion-p6200-desktop-pc-series with intel pentium inside and IpIBl-LB

I would like any fixes and i need them right now because this is my last computer.

[BeemerBiker]

When powering up does the keyboard LED lights flicker?    The CAP and NUM lock key should light up indicating power.

The monitor "power on" should light up momentarily when the system is switched on in addition to the keyboard.

Your system probably had two graphic devices.  Try both the add-in graphics card and the built in.  If neither of them work then remove the add-in card and try the motherboard one.  

[Danielatheer]

nope nothing works my monitor works but does not display anything it just says monitor going to sleep