The "siren" is most likely an overheating warning. When you replaced the 
power supply, you probably disturbed the CPU heat sink/fan. Reset the 
heat sink/fan making sure they are firmly attached to the CPU. Also 
check to make sure the CPU fan is plugged in to the motherboard.

Hope this helps.

Tom Mayer

[log in to unmask] wrote:
> Hello:
>
> The power supply fan in this box stopped. It was pulled from power in very timely fashion. I purchased a new Antec 350W power supply. After hooking it up I receive my red light to the motherboard then a additional green light. Immediately a two tone siren with several quick codes flashed on a status bar with 2.1. at the end before removal power. I have tried clearing the CMOS. I have also seen 26 on the status light. The post codes are at http://fae.abit.com.tw/eng/faq/note/AWARD_and_uGuru_POST_code_v101.pdf  I am not sure what they mean. I have both the main power plug and the 4 prong plug next to it pluged in.  Any help would be apppreciated. 
>
>
> Richard F. Bolha
>
>
>
>
> [log in to unmask]
> EarthLink Revolves Around You.
>
>                          PCBUILD's List Owners:
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>                        Drew Dunn<[log in to unmask]>
>
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>
>   

                         PCBUILD's List Owners:
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