system shuts down

Troubleshoot the system by installing one card at a time,the SCSI card may be causing the shut down,because each end has to be terminated ,apply the terminators to see if this solves your problem

This sounds like a SCSI BIOS problem. I suspect the board SCSI is taking over the startup from the MB BIOS and the computer is looking for the OS on a SCSI drive. If you have the setup instructions for the SCSI board follow them to the letter as this is the kind of problem that can happen. If you have another PC with a SCSI drive with an OS on it you could try removing the existing IDE drives in the PC and try booting to the borrowed SCSI and if it boots, that is what is apparently happening.

There are a lot of things to try.
Make sure that the boot settings are correct in both the bios and in the scsi setup.
Try the card in both of the pci slots.
In the advanced setup, try diabling the "system bios cacheable".
In the pci/pnp setup page set the primary graphics adapter to agp. Disable the irq for pci vga.
In the features page, check the parralel port dma setting and make sure that it is different from the scsi card.
Try disabling onboard features such as sound/modem/lan/usb for Dos as a trouble shooting measure the narrow the conflict range.
Another thought is that no one ever says what brand or model of power supply they are using. Not all power supplies are created equal. Just saying it is a 350w p.s. is like describing your car as "4 wheeled". Some addin cards have very tight power requirements that all power supplies can meet. You have a budget mobo and I suspect you have a budget case/p.s. too.
Try one thing at a time.
Good luck!

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