PC shuts down with usb sandisk

I assume the cable from the card reader is plugged to the motherboard (MB).

I see at least two possibilities.

One, the cable was plugged incorrectly. Make sure it was not plugged backward.

Two, the MB may need BIOS flash. Go to the MB website and see if the issue has been addressed. If it has, do BIOS flash.
Also ask a technician from which you bought the MB whether the problem is common. He might give you good advice or recommendation.

You say that you tried a new power supply.
Did you try a larger (higher wattage) power supply?

If the PC shuts down just after POST, my thought is that the power supply does not have enough power for the extra load of the USB device.

Or, the motherboard is not capable of providing enough current from the on-board regulators to power USB devices.
You can check this by using a powered USB hub between the motherboard and the USB devices.

Chas

well I've seen some issues with older MSI motherboards with the VIA chipset where the onboard USB ports don't work and cause system freeze. This was an issue on the MSI K7T266 Pro boards. The USB bug was in the chipset AND on the mainboard and the only way around it was to use a USB PCI card. VIA did not issue an updated chipset and the MSI K7T266 Pro board was subsequently replaced with the K7T266 A Pro board with a new VIA chipset.

Another avenue to explore is backward compatibility of USB 2.0 to USB 1.1 on that MSI board. Though 99.9% of manufacturers say downward and upward compatibility, it's not always the case. Got a friend with a new[er]computer [USB 2.0], try the card reader on theirs. IF it works, might be a problem between USB 1.1 and USB 2.0 That particular MSI board is USB 1.0/1 compliant.