Pc with new parts starts and shuts down

Hello, i needed to upgrade my pc, so i bought couple new parts. I never instaled parts on my own, though i am quit sure that i instaled them corectly, but pc wouldnt work right.
i left my
old atx case,
power supply (420W).
old crt monitor
vga- gf 7600gt
and bought
AMD athlon II x3 450,
asus m4n68t motherboard,
kingston 2x 1gb dd3 1333 rams.
on the first boot i got message that expres gate failure, and need to update, then it shuted off. second try it booted and shut off in couple seconds, and etc. once it booted windows (ussing win XP) but keyboard and mouse didnt work so i shuted off, and everything again. it boots and after couple secs shuts off. it might shuts of at the time when monitor should swich on.
have no idea what to do, as i 10x checked wiring, swiched ram slots, tried with 1 ram stick, swiched hdd, dvd-rom cables, left only hdd, disconected hdd, dvd-rom, monitor. thermal paste was allready on heatsink, triple check, sure i did by the manual..
if anyone has any thoughts welcome to advice, thanks
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More about parts starts shuts down
  1. i did mistake there my cpu is athlon IIx3 445 not 450 and in support list there a no 445 cpu. does it make diference ? if there are like [..]430, 450, 455, [..] and no exactly 445 model ?
    i also tried disconecting vga card, and then pc seems to work longer, and in the end it shuts down.
  2. What kind of 420 watt PSU?

    At this point, you need the case speaker.

    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.

    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.

    This will be a little different if you have integrated graphics.

    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.
  3. yes i did all the "Work through our standard checklist and troubleshooting thread: "
    i cant messure voltage, because i have no idea how to do that, and i dont have with who to messure. there is no inside speaker (thing wich attaches to mobo).
    psu is : "sinan 420W" attached on top of case.
    i just instaled back my previuos parts wich are: athlon 64 3500+ and epox series 9npa nforce 4 mobo (atleast that sayd in manual) and everything is working just fine..
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