I’m having a little trouble with a Dell GX270 slim, the thing wont boot, when I press the power all it does is fan comes on and green and orange light come on, and all this happens for maybe 1 second then it shuts down, it does have the 4 lights on the back for self diagnostics but I can’t even get it to post so forget looking up the code, I know it’s not the power supply cause I’ve tested with another that’s fine and does the same thing, I have also tried resetting the CMOS by removing the battery and placing it back in and also tired resetting the BIOS with the jumper, any suggestions?