Restarting when loading windows(NEW MOBO,RAM,PSU)

hey guys.

I recently bought a MOBO p5q se plus and a 2x2 gb corsair XMS2 PC800 ram . THe computer would not start up so i took it to the technition and he said i have a bad PSU, so i went ahead a bought a 115 euro corsair 650W PSU. the power problem was solved and now i am getting stuck at the windows loading screen. whenever the computer get's passed the bios and starts detecting drivers, then the logo of WIN7 apears and the computer restarts. i tried with 2 HDD bot not formated, WIN7 and WINXP. Could it be a foult in the ram? in the mobo? in the PSU maby?


im thinking my newly bought PSU may not be enoug power for my system. here is my system

intel E8400
p5q se plus

my PSU is this one
Corsair 650Watts TX Series PSU

thanks for your time reading this and hopfully you guys will save my 2 days worth of work and expensive hardware
2 answers Last reply
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  1. First of all, the Corsair 650TX is an excellent PSU. A good 550 watt PSU is all you need to power your system.

    Can you boot from a CD and partition and format a hard disk?
    Does the CD load all the files onto the hard drive and start installing Windows?

    Here is what I think is happening: Your system is successfully posting. So the CPU works. The video card works fine in character mode. And the memory has passed basic RAM tests.

    So it is now time to start eliminating components.

    I think the PSU is OK. Two different PSU's show the same symptoms and the Corsair is a very good model. But if you can test it in another system, that would confirm that it is good.

    Test your video card in another system to make sure it is OK.

    You can test your RAM by downloading and running memtest86+. It makes a bootable disk so you do not need Windows to run it.

    If all of the above tests good, that pretty much eliminates everything except the motherboard and the CPU. And CPU problems are very rare.

    If none of the above works, it is time to get serious. :) Standard cut and paste follows.

    Work through our standard checklist and troubleshooting thread:
    I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

    If not, continue.

    I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different.

    Breadboard - that will help isolate any kind of case problem you might have.

    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:

    Make sure you plug the CPU power cable in. The system will not boot without it.

    I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case.

    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:
    Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the
    system is booting.

    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.

    You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.

    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.
  2. uhhh.. what he said. You should compile this into a troubleshooting guide then maybe sticky it or something.
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