Problem with XP 1800+

[sabwafare2001]

Here's the problem. When I first installed my motherboard, I switched it to 133mhz or 266fsb and it posted as it noramlly should as a XP 1800+. I even overclocked it to about 1600mhz. After 3 days of working normal, one night I cut the computer off and when I got up in the morning to cut it on, it showed the screen where it detects the drives, then the monitor loses its signal. So I switched it back to 100mhz or 200fsb and it posted as normal but the speed was at 1150mhz. Now I am stuck at this speed and can't change it. When I had my ECS KS57A mothboard and the same setup, it did exaclty the same thing. So could anyone tell me what could be the problem. Thanks for your help.

Gigabyte 7VRXP
Xp 1800+
ATI 8500LE 64mb video card
pc2100 256mb
400W Allied psu
lite-on 24x10x40 cdrw
lite-on 16x dvd
ibm 80gig 7200rpm hard drive
fujitsu 20gig 5400rpm hard drive
Creative 56k V.92 pci modem
3 case fans

 

[Yharn]

if you put it back to the 266 bus speed it should read correctly again.

 

[sabwafare2001]

I already tried putting it back but it does the same thing