New PC build starts and stops repeatedly

January 31, 2013 at 07:04:06
Specs: Windows XP
I recently built a new PC. I followed the installation manuals and videos very carefully. After about a day of use with NO problems, I properly shut down the system. The following day, the computer started and stopped repeatedly in a 5 - 10 second cycle. Eventually this fried the motherboard.

At the time, I assumed that it had been a faulty motherboard and had it replaced. After receiving the new board, and being even more careful with installation, it ran like a dream for 12 to 24 hours. Then I shut down the system... When I tried to start it up this morning, the cycle issue started again.

Any suggestions made would really be appreciated. Thanks in advance.

(windows 7 64 bit... not XP)

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January 31, 2013 at 09:31:35
Please list the complete system specs in detail - make/model of board, CPU, RAM, video card, HDD, & especially the power supply. Also, which method did you use to apply thermal paste when mounting the heatsink on the CPU - center dot, vertical line, horizontal line?

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January 31, 2013 at 15:14:06
Especially the power supply. That would be my guess, assuming you installed everything correctly.

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January 31, 2013 at 19:29:38
UPDATE: I attempted to boot the computer with a flat head screwdriver on the power up contacts (in case the tower power button was faulty). Just as it did the first time following the on/off cycle, board and fans power on with no POST beep and no video output.






- Toshiba HDKPC03 DT01ACA100 1TB Hard Drive - 1TB, 7200 RPM, SATA, 3.5"

- ASUS ENGTX560 DCII OC/2DI/1GD5 GeForce GTX 560 (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

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Related Solutions

January 31, 2013 at 19:30:25
Thermal paste was pre-applied

I ran this system successfully for about 12 hours on both occasions. The issues started after shutting down the computer for the first time.

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January 31, 2013 at 20:16:45
This is the problem we have in more numbers, so there is no issue in board means once unplug and plug the RAM and HDD cables,
then start the windows, if problem repeats again means once repair your Operating system then it ll work properly

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January 31, 2013 at 20:27:06
I tried resetting the RAM card and unplugging/plugging in the HDD cables with no effect. Navneeth, are you suggesting that the problem could be with the operating system?

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January 31, 2013 at 21:30:37
"Thermal paste was pre-applied" - That was fine the first time, but when you changed the motherboard, you needed to remove the heat sink. Therefore you need to remove all of the old thermal compound and reapply it (correctly). Look:

Although you can try a start up repair, I would look to the power supply as the source of the problem. If you have a suitable power supply around, use that to test things. Customer's on TigerDirect (not available NewEgg) do not rate it very good and 3 of them received them either DOA or failed almost immediately. Return it to where you purchased it and get something better. A poor quality power supply can cause all kinds of problems and fry expensive components if they are really bad.

You have to be a little bit crazy to keep you from going insane.

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January 31, 2013 at 21:47:01
I'll make sure to replace the thermal paste when I get this issue sorted out.

I'm going to take my PSU in to get tested at a computer shop tomorrow, though I don't understand why issues would pop up in the way that they did...

1. Runs for 12 hours (both basic programs and the game "just cause 2").

2. After shutdown goes into a start/stop loop.

3. After cutting power lights and fans work with no video or POST beep.

4. Replaced motherboard, SAME 1-3 steps occurred.

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February 1, 2013 at 05:12:22
You should be using the "vertical line" method for applying thermal paste on the i5. But I suspect your problem is this ---> ULTRA LSP550 PSU.

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