your computer does not support 1GB memory sticks. The max memory for that system is 1GB which would be 2 sticks configured as 512MB
see below for the specs (i bold, italics and underlined the main part)
Processor
Intel® Celeron® M Processor 370
1 MB L2 Cache | 1.50 GHz | 400 MHz FSB
Display Screen
14-inch Widescreen Ultrabright™ WXGA TFT
Chipset
Via VN800
Memory
256 MB DDR2 (1 × 256 MB) SODIMM
Total slots: 1 DDR2 slot | Available slots: 0 DDR2 slots
Expandable to 1 GB
Video
S3 Graphics UniChrome™ Pro IGP
Up to 64 MB shared VRAM
Audio
AC'97 2.3 Compliant
Hard drive
40-GB 4200 RPM hard drive
Optical drive
DVD +/- RW Multi-Format Double Layer
Write maximum: 8X DVD+/-R, 6X DVD-RW, 8X DVD+RW, 2X DVD-R DL, 2.4X DVD+R DL, 24X CD-R and 16X CD-RW discs
Read maximum: 24X CD-R/RW/ROM, 8X DVD-R/RW/ROM, 4X DVD+/-R DL, RAM discs
Media Reader
4-in-1 Digital Media Manager
Secure Digital™, Memory Stick®, Memory Stick-Pro®, and MMC™
Modem
56K ITU V.92 ready fax/modem
Network
10/100 Mbps built-in Ethernet
802.11g integrated wireless (up to 54 Mbps)
Interfaces
- 2 - USB 2.0 ports
- 1 - VGA external connector
- 1 - RJ11 (modem)
- 1 - RJ45 (Ethernet LAN)
- Microphone jack
- Headphone jAck
Pointing device
Touchpad with vertical scroll zone
PCMCIA
1 - Type I or Type II; Card Bus
Battery
6-cell Lithium-ion
Dimensions
1.1 to 1.24-inches (H) × 13-inches (W) × 9.7-inches (D)
28 to 32 mm (H) × 330 mm (W) × 246 mm (D)
Weight
5.01 pounds
Processor
Intel® Celeron® M Processor 370
1 MB L2 Cache | 1.50 GHz | 400 MHz FSB
Display Screen
14-inch Widescreen Ultrabright™ WXGA TFT
Chipset
Via VN800
Memory
256 MB DDR2 (1 × 256 MB) SODIMM
Total slots: 1 DDR2 slot | Available slots: 0 DDR2 slots
Expandable to 1 GB
Video
S3 Graphics UniChrome™ Pro IGP
Up to 64 MB shared VRAM
Audio
AC'97 2.3 Compliant
Hard drive
40-GB 4200 RPM hard drive
Optical drive
DVD +/- RW Multi-Format Double Layer
Write maximum: 8X DVD+/-R, 6X DVD-RW, 8X DVD+RW, 2X DVD-R DL, 2.4X DVD+R DL, 24X CD-R and 16X CD-RW discs
Read maximum: 24X CD-R/RW/ROM, 8X DVD-R/RW/ROM, 4X DVD+/-R DL, RAM discs
Media Reader
4-in-1 Digital Media Manager
Secure Digital™, Memory Stick®, Memory Stick-Pro®, and MMC™
Modem
56K ITU V.92 ready fax/modem
Network
10/100 Mbps built-in Ethernet
802.11g integrated wireless (up to 54 Mbps)
Interfaces
- 2 - USB 2.0 ports
- 1 - VGA external connector
- 1 - RJ11 (modem)
- 1 - RJ45 (Ethernet LAN)
- Microphone jack
- Headphone jAck
Pointing device
Touchpad with vertical scroll zone
PCMCIA
1 - Type I or Type II; Card Bus
Battery
6-cell Lithium-ion
Dimensions
1.1 to 1.24-inches (H) × 13-inches (W) × 9.7-inches (D)
28 to 32 mm (H) × 330 mm (W) × 246 mm (D)
Weight
5.01 pounds
Processor
Intel® Celeron® M Processor 370
1 MB L2 Cache | 1.50 GHz | 400 MHz FSB
Display Screen
14-inch Widescreen Ultrabright™ WXGA TFT
Chipset
Via VN800
Memory
256 MB DDR2 (1 × 256 MB) SODIMM
Total slots: 1 DDR2 slot | Available slots: 0 DDR2 slots
Expandable to 1 GB
Video
S3 Graphics UniChrome™ Pro IGP
Up to 64 MB shared VRAM
Audio
AC'97 2.3 Compliant
Hard drive
40-GB 4200 RPM hard drive
Optical drive
DVD +/- RW Multi-Format Double Layer
Write maximum: 8X DVD+/-R, 6X DVD-RW, 8X DVD+RW, 2X DVD-R DL, 2.4X DVD+R DL, 24X CD-R and 16X CD-RW discs
Read maximum: 24X CD-R/RW/ROM, 8X DVD-R/RW/ROM, 4X DVD+/-R DL, RAM discs
Media Reader
4-in-1 Digital Media Manager
Secure Digital™, Memory Stick®, Memory Stick-Pro®, and MMC™
Modem
56K ITU V.92 ready fax/modem
Network
10/100 Mbps built-in Ethernet
802.11g integrated wireless (up to 54 Mbps)
Interfaces
- 2 - USB 2.0 ports
- 1 - VGA external connector
- 1 - RJ11 (modem)
- 1 - RJ45 (Ethernet LAN)
- Microphone jack
- Headphone jAck
Pointing device
Touchpad with vertical scroll zone
PCMCIA
1 - Type I or Type II; Card Bus
Battery
6-cell Lithium-ion
Dimensions
1.1 to 1.24-inches (H) × 13-inches (W) × 9.7-inches (D)
28 to 32 mm (H) × 330 mm (W) × 246 mm (D)
Weight
5.01 pounds
Processor Intel® Celeron® M Processor 370
1 MB L2 Cache | 1.50 GHz | 400 MHz FSB
Display Screen 14-inch Widescreen Ultrabright™ WXGA TFT
Chipset Via VN800
Memory 256 MB DDR2 (1 × 256 MB) SODIMM
Total slots: 1 DDR2 slot | Available slots: 0 DDR2 slots
Expandable to 1 GB Video S3 Graphics UniChrome™ Pro IGP
Up to 64 MB shared VRAM
Audio AC'97 2.3 Compliant
Hard drive 40-GB 4200 RPM hard drive
Optical drive DVD +/- RW Multi-Format Double Layer
Write maximum: 8X DVD+/-R, 6X DVD-RW, 8X DVD+RW, 2X DVD-R DL, 2.4X DVD+R DL, 24X CD-R and 16X CD-RW discs
Read maximum: 24X CD-R/RW/ROM, 8X DVD-R/RW/ROM, 4X DVD+/-R DL, RAM discs
Media Reader 4-in-1 Digital Media Manager
Secure Digital™, Memory Stick®, Memory Stick-Pro®, and MMC™
Modem 56K ITU V.92 ready fax/modem
Network 10/100 Mbps built-in Ethernet
802.11g integrated wireless (up to 54 Mbps)
Interfaces •2 - USB 2.0 ports
•1 - VGA external connector
•1 - RJ11 (modem)
•1 - RJ45 (Ethernet LAN)
•Microphone jack
•Headphone jAck
Pointing device Touchpad with vertical scroll zone
PCMCIA 1 - Type I or Type II; Card Bus
Battery 6-cell Lithium-ion
Dimensions 1.1 to 1.24-inches (H) × 13-inches (W) × 9.7-inches (D)
28 to 32 mm (H) × 330 mm (W) × 246 mm (D)
Weight 5.01 pounds
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