Hardware upgrades on 12 year old stationary PC

[SO•Wax]

(2019-02-10 12:02)MariusMM Wrote:  So I have received the new parts (SSD, 4GB extra RAM and new CPU Q9550).

I installed the SSD a couple weeks back, that was a simple and smooth upgrade. It was using a new computer, crazy fast compared to old HDD.
Then a couple nights ago I installed the 2 extra ram sticks, that was also simple and smooth, basically just stick them in the slots. Can probably feel a small difference when using a couple heavy programs at the same time.

Then last night I went for the CPU change, from Duo CPU E8400 to Quad Q9550. Little did I know I was gone troubleshoot for the next 5+ hours...

I successfully replaced the old with new (new thermal paste of course), and went to boot it up, and it would not get past this screen:

Spoiler (Click to View)

I could restart PC and spam the delete key, and sometimes get into this:

Spoiler (Click to View)

After googling and back and fourth, resetting BIOS (or more correctly "clear CMOS Jumper"), I ended up putting back the old CPU... It starts up the PC more or less like before I tried to replace the old CPU with the new CPU.
I woke up this morning again and felt I should give it one more shot before I cry for help, but it was the same result as last night. I'm back on the old CPU now...

Here is the hardware that the PC use now:

Spoiler (Click to View)

So anyone have any idea what just happened there? I'm walking around in the dark here, this is not my field. Any help is appreciated.

Did you try to update your bios? Sometimes old BIOS don't support newer CPUs, so that might be the problem.