I was trying to upgrade my RAM; I have 2 x 2 OCZ DDR3 1600Mhz RAM installed. I wanted to install a single stick 4gig G.Skill Ripjaws. I took out the RAM and installed the Ripjaws; my system turns on but no display. So I turned it off and turn it back on again, this time the computer goes on for 3 seconds and turns itself off and it repeats. When I had the Ocz RAM, I configure the ram to run at 1333 MHz because it was running at 1066 MHz (I should set it to 1600 MHz). So I thought maybe the RAM was bad, I took it out and put in my previous RAM and it does the same thing. I tried to reset the CMOS setting, didn't do anything, tried to reset it again. After that my computer won't even power when I press the power button. What could be the issue? I don't have another PSU to test the system.
My System Spec.
i5 760 @ 2.8ghz
Corsair 450 Watts PSU
OCZ Vertex 2 SSD
Raid 1 HHD
I checked all connection; I am a very technical guy. I had a gigabyte motherboard before this Asus board, my gigabyte worked great for 2 hrs and then it just keeps on restarting itself (like my asus now). Maybe it's very sensitive to the type of memory.
I couldn't get into bios, when I press the power button nothing happens. I hook up my old computer using my corsair psu and it works, looks like the board is done. 2 motherboards died within a month, kinda related issue with RAM.
Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. You do have a case speaker installed, right? If not, you really, really need one. If your case or motherboard didn't come with a system speaker, you can buy one here: http://www.cwc-group.com/casp.html
You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU.
Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.
If no beeps:
At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.
The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.
This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.
If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card. Silence or long single beeps indicate a problem with the memory.
Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.
Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.