Studio xps 8100 gpu upgrade to gtx 570

Hello,
I just upgrade my studio xps 8100 (i7 860/ 12 GB RAM/HDisk 1 unit 750GB+1 unit 1T) from GT 220 to GTX 670 (Leadtek). and PSU originnly Dell (Liteon 350W) to Cooler Mater 620 W 80+ Broze. After upgrading it, it connot run with my APC UPS 1100 VA 660W, and as a risult, I got message from BIOS==>CMOS error checksum, press F2 to configure BIOS or F1 to reset to default.
I decide to run it without UPS, and it run smooth till I got problem in the end of SHUTDOWN PROCESS.
I found that it can't shutdown. I mean, after shutting down, the CPU and its fan still running till I switch off the PSU.
SOS...SOS...SOS...I need help..please
Thanks in advance for the suggestion and solution

Astra (Bandung, Indonesia)