It just wont boot ....

[Blearky]

So first hi guys im new to the forum.

And here I am bringing up the last pieces of my strength to talk to you and hope that u can help me.

Like u can read in the tile my desktop PC wont boot.

How did it happened: I am a gamer and hobby streamer but my pc started to acted strange.

So like I stream now since a year but since a few month the stream lagged and games otehr software too. But I guessed it was ok since the 4 years I know have it.

So I said to myself why not just deinstalling everything having a clean new one ( I just used the windows 10 option for this) and it worked.

But now after a few days I had new problems like Games would get laggy even if the FPS shows 90 fps and I had a normal ping.

So I remembered that I didnt changed all settings in the bios.

When I was there I changed a setting ( AND I KNOW THIS IS TOTALLY DUMB ) that maybe I should have never changed.

Im not really sure what it was exactly but something like " DUAL Monitoring use CPU and GPU" or so.

Since then my PC just wont boot anymore. I tried it lots of times but it never booted except for 2 times.

1 time was nearly at the beginning and I thought to myself well it will work just fine right now so I let it go through and it led to a trouble saying that it couldnt load.

The other time occured while I pluged in a usb stick again I had in the pc the whole time took it out for some reboot options and I even got into the bios to change the settings.

The only problem you may ask?! Well I had forgotten to insert the bios battery again so the settings where not saved. 

So far so good .

Well I just want to share everything I can give u as information.

Specs:

CPU i7-3770 ( no OC)

standart Intel-CPU-Cooler

4x4 GB of DDR3 1333 RAM

Asus P8B75-M Mainboard

GTX 960 4G MSI GraKa

530W 80Plus Bronze BeQuiet PSU 

2TB HDD Seagate 

256 SSD (WIndows Installed on).

 

Which Steps have I done so far:

- reobooted 

- checked if all pins are connected

- checked if everything sits on the right place 

- pulled out bios battery and unpluged it from energy. Waited put it back in and rebooted it.

                 - did it again this time switching the  CLRT Sleeve from 1/2 to 2/3. Them moved it back and tried to reboot.

- took out everything so that just the cpu will reamain

        - boot: one long beep 2 short beeps 

                   - looked them up error for memory 

        -  insert one RAM on A1 and rebooted ( no beep anymore) 

                   - tried out different ramslots with every ram no beeping anymore 

(tried out anything with the bios Battery changes written above too) 

                                                    -  guessed RAM isnt the problem -

- insert another PSU (worked fine on another system) 

             - same error like the normal PSU

                                                   - guessed USP isnt the problem-

- tried out every single bootdevice I could imagine :

                 - tried out just ssd = no boot

                                        hdd = no boot

                                        usb = no boot

                                                     - guessed it couldnt be the harddrives-

-dismounted the cpu-cooler

                 - checked the socket for broken pins,dust etc nothing found 

                              -  put back cpu again

                                                    - guessed it isnt the socket ( cant say anything about cpu cause I dont have another one to test).

- did every step with GPU in and out but motherboard doesnt care about it.

                 - tried GPU in another PC it worked.

                - tried different GPU ( GTX 550 TI) same as current GPU

                                                     - guessed it isnt the GPU.

-Took out the whole Mainboard of the case to  rule out a shorter.

                - acted like all the tries I had it inside the case .

                                                    - guessed its not one of the shorts.

 

No while Im sitting here and had like 100 different boot up results from:

1. it doesnt start 

to 

100. It starts but I forgot to insert the bios battery and the changes where lost.

I am at the end ... 

I cant figure out what it is and I spend a whole day searching for the mistake.

It could be the motherboard but I dont have another one to check out.

I would really appreciate some help and I am sorry for my bad english but it had been a rough day.

Have a nice weak.