Can't connect to Internet after sleep mode

Hi,
Most times after put my iBook in sleep mode and reopen it, I can't connect to Internet. I use a normal cable connection by ethernet, but at these times, when I check the network status, it says I don't have any cable connected. The modem apears to be OK, with the computer's light on. I plug off and plug in the cable and it doesn't change and it happens the same when I click in DHCP renew - it just doesn't give any IP adreess. I need to restart the computer to get the connection again.
Ibook G3 700 Mac OS X (10.4.7)

I am trying other solutions today.
It can not change to another wifi network without switch off the wifi.
That's mean I have switch off and re-open the wifi signal every time when it show like this capture.
I waiting for more than 5 mins and it will search another wifi network automatically but it still "No internet connect".
My MacBook Pro is no any WiFi issues.

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OSX v 10.8.5
Model Name:          MacBook Pro
Model Identifier:          MacBookPro8,3
Processor Name:          Intel Core i7
Processor Speed:          2.4 GHz
Number of Processors:          1
Total Number of Cores:          4
L2 Cache (per Core):          256 KB
L3 Cache:          6 MB
Memory:          8 GB
Boot ROM Version:          MBP81.0047.B27
SMC Version (system):          1.70f6
Serial Number (system):          C02HH142DV10
Hardware UUID:          C6AC7046-2B2B-5DE5-BE83-447EAE22E250
Sudden Motion Sensor:
State:          Enabled
Network
Software Versions:
CoreWLAN:          3.4 (340.18)
CoreWLANKit:          2.0.2 (202.11)
Menu Extra:          8.1 (810.11)
configd plug-in:          8.5 (850.252)
System Information:          8.3 (830.5)
IO80211 Family:          5.3 (530.5)
Diagnostics:          2.1 (210.25)
AirPort Utility:          6.3.1 (631.4)
Interfaces:
en1:
Card Type:          AirPort Extreme (0x14E4, 0xD6)
Firmware Version:          Broadcom BCM43xx 1.0 (5.106.98.100.17)
MAC Address:          10:40:f3:b1:49:36
Locale:          FCC
Country Code:          US
Supported PHY Modes:          802.11 a/b/g/n
Supported Channels:          1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 149, 153, 157, 161, 165
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AirDrop:          Supported
Status:          Connected

Hello ghesser,
Thank you for the details of the issue you are experiencing with Wi-Fi on your MacBook Pro after setting up your Time Capsule. I would be concerned about this too.
I recommed reviewing the full article and specifically the section labeled, "Symptom: The network connection drops unexpectedly" in the following article to resolve an issue like the one you described:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Thank you for posting in the Apple Support Community.
Best,
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