screen saver doesn't work

[watons]

I am using kalyway10.5.3 on my T60,and about This mac show as below.

 

Display:

 

Type: Display

Bus: PCIe

PCIe Lane Width: x16

VRAM (Total): 128 MB

Vendor: ATI (0x1002)

Device ID: 0x7145

Revision ID: 0x0000

Displays:

Display:

Resolution: 1400 x 1050

Depth: 32-bit Color

Core Image: Hardware Accelerated

Main Display: Yes

Mirror: Off

Online: Yes

Quartz Extreme: Supported

 

...I set the screen saver automatically activated in 3 minutes,

but it doesn't work automatically after 3 minutes,

(I installed the RainyDay2 screen saver...)

what's the problem?...who can help me?