Bought new GPU - No signal even with old one.

Moskiz

Honorable
Sep 25, 2013
4
0
10,510
My computer worked fine this morning. I went to collect my new GPU and before I installed it I removed the old GPU from Device Manager. I shut the computer off and changed the old GPU for the new one but my PC would not show video on the monitor. The only thing that was different from the time before was the graphics card. I tried putting the old GPU back but that did not work either.
I have had problems with my RAMs before. They have to be put in a specific way to work. I have a MSI P45 Neo-F motherboard and it supports DDR2 only I think. In the manual it says RAM has to be connected to the first RAM-slot and the third RAM-slot. That's 2 green colored ones. There are 2 orange ones as well.


Now I'm stuck here and here's a few things I've tried:
*Taking the CMOS battery out for 5 minutes - did not work.
*Using the Motherboard Jumper to reset the CMOS - putting the jumper on Reset Data and starting the PC does not work, it does not boot at all. I put it back on Keep Data and it boots, but n o signal.
*Tried different combinations of the RAM like using different colors, same colors in all ways. I also bought 2 new identical RAM and tried putting them in, did not work either.
*There are no beeps at all. Tried removing GPU - no beeps, then I tried removing the RAMs - no beeps, then I tried removing HDD and CD/DVD player - no beeps.

From this I guess that the mobo is broken but this is the way it has always been. I've had problems before when I upgraded from 2 GB to 4 GB RAM. I had no beeps back then but I tried different combinations on the RAM slots and my PC started. Now I've tried everything and nothing works.

Motherboard: MSI P45 Neo-F 775-socket
Old GPU: Sapphire Radeon HD 4870x2 2GB GDDR5. (It's one GPU, not 2. The GPU is called 4870x2)
New GPU: Sapphire Radeon HD: 7950 3GB
CPU: Intel Core 2 Quad Q9650 3,00 GHz
PSU: Corsair 550W

Please help! Thanks in advance.

EDIT: What the hell! I just spammed F8 and the computer started with the old GPU... I'll try with the new one.
EDIT2: I tried doing the same with the new GPU but it does not work! Please help.
EDIT3: It probably has nothing to do with the F8 button. I think the power cables were connected in the wrong way and I pressed them in a little and it worked with the old GPU. Help!
 

Moskiz

Honorable
Sep 25, 2013
4
0
10,510


Will do. But it's weird because apparantly I have a 550W PSU and my old GPU (which I've had for 5 years) needs min. 650W. It comes on at random. Like, I have to restart the PC a few times and maybe disconnect and connect the cables to make it work. It feels like it works at random, like 5% chance or whatever. I've gotten it to work 3 times so far and all I did was to disconnect it, and connect it again and then restart it a few times. The new GPU, however, I've not gotten to work.