When i changed the components, the problems started to show up:
A. At first i changed all (PSU, video card, SSD) with only keeping the SSD connected, not the HDD-s. The first thing i noticed is that after i press the power button, the system (PSU, Video, CPU) will start for about 5 seconds with no video signal, then all will turn off for the same 5 seconds then finally start again and "work properly". I say "work properly" because the only thing that happened is that i got video signal but only the BIOS screen for about 2 miunutes, then the system will boot. Keep in mind that i cannot use any command to enter BIOS, boot screen, or anything. The only confirmation i got that the keyboard is working is that Ctrl+Alt+Del is restarting the computer
I decided to start excluding the items i recently bought to find out what is the problem
1 - BIOS/CMOS reset: same behavior, no screen to confirm the reset was made
2 - removed all except CPU and RAM and connected the old PSU. Display connected to on-board video card: the same start-up behavior: on for 5 sec, then off for 5 sec then on for good (previously with the old PSU the system turned on normally - press power button, system started immediately); but i got the CMOS reset notification, regular lasting BIOS screen and prompt for bootable media, as no drive was connected
3 - kept the above configuration, but with new PSU: same behavior: ON/OFF/ON, then boot normaly
4 - kept the above and added the SSD: same behavior, managed to install Win 7 64bit using a flash drive to see if there is stability in the system - all OK (still the ON/OFF/ON initial startup) - from now on, every power on of the system is made with that cursed pattern ON/OFF/ON
5 - kept the above and installed the old GPU: all ok, video card detected in Windows also
6 - kept the above and changed to the new GPU: BIOS screen froze (see paragraph A) - but after those 2 minutes, the system booted up and even Windows recognized the new graphic card
Now my questions to you are:
a) Why is there that annoying ON/OFF/ON pattern since i tried the new PSU but now with BOTH PSU-s, and is there a way to fix it? I am suspecting that is a PSU issue, but why is it now happening with the old PSU aswell - this indicates an issue with the motherboard
b) Why is there that huge 2 minutes freeze in BIOS screen when i'm using the new GPU?(because it is still happening)
c) What are your oppinions on this? What feedback do you have? Have you seen any similar issue anywhere?
I am now planing to perform a BIOS update and hope i'll be able to change something. Also I am going to test the new GPU at a friend's to completely exclude its fault for all of this
Hopefully you didn't get bored on this long topic, because I am unable to understand why it's happening, and i am really counting on some valuable info from your side, guys!
*later Edit: If I press the power button while the BIOS screen is froze, the system will immediately turn off, only to start again 5 seconds later (i can only end this loop by waiting to boot and turn of from windows, or by turning the PSU off)