Changed Athlon 64 x2 5200+ to x13 multiplier and became unbootable

CoolmanT

Honorable
Sep 29, 2013
92
0
10,660
I changed my Athlon 64 x2 5200+ to x13 multiplier yesterday. When I reboot my PC, it shows nothing on the screen, how can I fix this? The mainboard is Foxconn A7GM-s.