Question about Tyan Trinity S2090 Motherboard

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Computer keeps re-booting while installing any operating system

Computer had a power supply failure. After installing a new power supply, computer kept re-booting. Tried to wipe out harddrive and install fresh xp.
Loads up to the point where windows says it will reboot, remove any floppy disk in A drive, then keeps re-booting. Since then, i have swapped out 3 different harddrives, 4 different pc133 mem's, 3 different cpu's (2) 1.5G's P4 and one 2.0g celeron. (2) different video cards, (2) different cd drives, (2) power supplies, and a NEW motherboard. I have attempted fresh loads of XP on each darddrive and all fail at the same point, tried '98 this completly loads but then starts re-booting, and linux from an live cd and it reboots during loading. I've tried disconnecting every piece of hadrware not necessary...
Anyone have any suggestions? Both motherboards are tyan s2090.

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  • 3 more comments 
  • casey460 Apr 21, 2009

    3 total power supplies...

    downloaded new bio, no change...???

  • casey460 Apr 21, 2009

    300w power supply...

  • casey460 Apr 21, 2009

    that's possible, but this computer ran for years on the same watt power supply???

  • Nicolas
    Nicolas May 11, 2010

    Hi Again!

    That 300w is enough to at least start and install OS on one disk, if you add more disks and maybe a powerfull gpu it will fail, but for now it will work.

    Well, since u you almost changed every hadware and it still dosent work, it only remains one thing to try, the HDD, try with another HDD

    You changed the ram, psu, cpu and the MoBo, there isent mutch left that can fail, only the HDD.

    Let me know how it goes


  • Nicolas
    Nicolas May 11, 2010


    Well, thats an old MB you have there, i suggest you download and install new bio, You can download it from here

    Let me know how it goes




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  • 371 Answers

Were the two power supplies you tried inclusive of the original failed drive or not. In other words did you try a total a 3 power supplies including the one that failed?

If not, please do so. That is, immediately analyze the original known part failure, the power supply or its connection to the board(s) you have tried.

Congratulations for such an exhaustive process of elimination.

Posted on Apr 21, 2009

  • 1 more comment 
  • Maurice B Thomas
    Maurice B Thomas Apr 21, 2009

    Based on nic's observation, have you checked to determine that the new power supplies are not overrated for the older motherboard, as your Core duo and newer CPUs plus all the peripherals might have tempted you to supply greater power than that for which the board is rated?

  • Maurice B Thomas
    Maurice B Thomas Apr 21, 2009

    Only 300W?? Forget what I said about overpowering the board, as the opposite is apparently true.

    With the load you described, 300 Watts is WAY TOO SMALL. The power supply that small also explains why you had a power failure,as the power demands were in excess of what it could supply.

    You need at least 400 Watts or more but make sure not to exceed the power supply max of the board, although the board's components will make appropriate demands depending on your available power and the supply will conk out when reaching its max.

  • Maurice B Thomas
    Maurice B Thomas Apr 22, 2009

    You have added components and a more powerful and power hungry CPU along with data and software which increases the spin on your harddrive requiring more power than you used to use and the power supply you have is no longer adequate.

    Try a 400 Watt unit, as the more technically complicated method of power metering and monitoring during use is more trouble than you need to determine that 300 Watts is kinda small for today's needs.

    A little history.

    The first IBM PC issued in August of 1981 was considered overpowered at 65 watts, but that was 28 years ago, literally Ancient History in computing.



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