Pc seems to be booting but doesnt post anything to the screen. I bought a new ddr3 ram and a used motherboard.
What is NOT clear to me, is - Did this problem ALREADY exist, on the original board and ram, and THAT was why you decided to try a new board and ram
OR was the new board and ram for some manner of upgrade and it is NOW that setup, that does not post.
Although I suspect from reading further down your opening post that ALL was in order before the new board and ram
1. What was the make and full model of the old board please
2. As you have tried breadboarding it - IT IS UNLIKELY of course that the problem is shorting on the case.
3. -plugging to the motherboard and gpu
That could read as connecting either to dedicated GPU the 750Ti as well as to the graphics on the I/O plate - integrated
4. The only monitor connection on that I/O plate is VGA DSub for the integrated graphics
Integrated in the North Bridge:
5. What Monitor is connected please and is it VGA DSub to the same on the monitor or with some form of adapter.
6.. The connections on the 750Ti depending on he actual MAKE of the card are
One Dual Link DVI-I,
One Dual Link DVI-D,
One mini-HDMI Standard Display Connectors
so as above how was that connected and again how to the monitor
7. Have you connected the
1 x 4-pin ATX 12V power connector
That is rather basic, but I do not know your level of experience and you would not be the first person to miss the 4 pin power for the CPU
8 Summary
At this stage and dismissing for the time being a fault on the board
I suspect incorrect or badly made connections for main power, aux 4 pin power or depending on case even headers for front panel etc.
OR providing all those, and others have been checked carefully the monitor connections as mentioned.
When you breadboarded it WHAT please did you connect.
You only need PSU, Monitor, keyboard and mouse. The drive and the 750ti card are NOT necessary to POST.
Finally if you wish my help would you kindly read my post carefully and answer in full ALL questions and queries.