First of all system specs:
cpu: intel 3770k
gpu: sapphire hd7950
mobo: Pegatron ipx58 (probably never heard of it, a very crappy chinese one)
8gigs of ram, corsair 650 psu
This is gonna be long so forgive me.
At first, my computer had no problems. Occasional (maybe once a week) bsod's mostly becaue i am using a ps3 controller and it's driver creates some problems. One day, i open up my computer and everything is super slow. It was like it didn't even want to run. Then i tried to reboot it, after a couple of times, it turned our okay. Browsed reddit a little bit then shut it down.
Then i opened it again after couple hours. Didn't work. Got some booting issues. I thought i'd troubleshoot tomorrow (which is today) than went to bed.
Now, here is the deal. At first, i got booting problems that would point a faulty hdd or windows installation. Missing operating system, windows failed to start, 0x000000e9 and so on. Sometimes it went into windows repair but even though i am using w7, it opened up windows 8's repair menu. I assume it's from a w7-w8 dual boot i had a while ago that i deleted from my pc. Nothing seemed to worked there. Now that menu doesn't even come up. So i thought i might give formatting a try and tried to go into bios to change boot priority to usb. Couldn't enter the bios. Tried every key, nothing worked. It gave me this CASPER logo which is my computer manufacturer. I am not sure if it's my pc's startup image or my monitors (it's casper too) (casper is a manufacturer in turkey)
I got too hopeless that i tried pulling the cmos battery out. Waited about 10 min. Started it to only see the screen that says "press this to go into setup, press that to do this" for a second. I pressed all the buttons and nothing couldn't get me into bios. Then casper sign again. Then nothing. I restarted it, it didn't bring up that screen, just casper sign again.
So i tried resetting bios 2 more times. 3rd time, the screen that tells me what to press to enter the bios stuck there a while so i pressed the buttons. I went into bios. First, i checked boot priority tab. There was only one item and that was SATA sm (or sd) no mention of hdd. So i thought it couldn't detect hdd but then i googled sata to find out it is the port hdd gets plugged in. (i remember bios clearly saying hdd though)
I had nothing to do there so i reset my computer, plugged my usb stick to see if i can access bios again and change my boot priority, casper sign all over again.
At this point, when i normally open my computer, it just says windows failed to start, a recent hardware or software change might be the cause.
info: the windows boot configuration data file does not contain a valid OS entry.
I know my writing skill is poor. If you got confused anywhere just ask me.
If you guys can figure this out, i'll be forever in your debt.
(i will be able to check answers till midnight which is about 1 hour. I will come back tomorrow as soon as i can. So sorry if i can't return to you and please don't stop assisting thinking my problem got fixed or i am not interested anymore.)