Sometimes after startup network is not available and I have to restart

I installed Windows 7 Ultimate 64-bit a few days ago. It's worked flawlessly for me, except for 1 thing. Sometimes, after I start the compute and login, I have no Internet access. There's a yellow caution symbol over the network icon in the system tray and if I click on it it says something like "no internet access" and "no home group access". Each time it's happened, nothing has fixed the problem for me except re-booting the computer, and it's always fine after the re-boot. What could be causing this problem?
14 answers Last reply
More about sometimes startup network restart
  1. Maybe the NIC is going bad? Is this integrated into your motherboard or is it an add-on card? Do you have another NIC that you can use to see if it has the same issues? Does this only happen on reboot or does your connection sometimes go away after you've been running for awhile?
  2. It's integrated into the motherboard, and it's a brand new build (that doesn't necessarily mean it's not going bad, I'm just saying). I don't have a NIC that I can use to test.

    It only happens on reboot, I've never been using the computer and then suddenly the network is unavailable.
  3. Could be the cable, does your motherboard have the new green nic detection feature that switches off nic if no cable detected?

    Could also be a dodgy driver, did it get installed by Windows or from cd, worth checking for a newer version.
  4. Are you talking about how the port kind of lights up when a cable is inserted? It does have that feature, and it does light up, although, I haven't checked it when this issue has happened.

    I didn't use the driver Windows had, I used the latest one available for my Motherboard from ASUS's website.
  5. scottw182 said:
    Are you talking about how the port kind of lights up when a cable is inserted? It does have that feature, and it does light up, although, I haven't checked it when this issue has happened.

    I didn't use the driver Windows had, I used the latest one available for my Motherboard from ASUS's website.


    Green LAN is a new feature on many motherboards which puts the LAN adapter itself (the one on the motherboard, not the LAN jack you plug the cable into) into a very low power state to reduce the amount of power the motherboard needs. Unfortunately it doesn't quite work properly yet on some boards (such as mine). On mine, when Green LAN is disabled, I get the same problem where Windows occasionally can't initialize the network adapter properly, and I am left with no LAN connection. Disabling the Green LAN feature in my BIOS solved the problem. Each time your motherboard manufacturer releases a BIOS update, try turning the feature back on to test. Eventually, these problems will get sorted out.

    Edit: Just for clarification, this is a BIOS issue, not a problem with Windows.
  6. I don't see anything about Green LAN in the specs for my motherboard. It's an ASUS M4A785TD-V EVO/U3S6. Here's the page for it on ASUS's website:

    http://www.asus.com/product.aspx?P_ID=Ic2Z48E0qdz0KwIU&templete=2
  7. Have you applied the latest BIOS to the board? Maybe it's an issue with the BIOS that's been fixed?
  8. No, I've considered that, but I've been putting it off as a last-resort. My last BIOS update with my last board didn't go well. I want the latest BIOS anyway though, so I may just bite the bullet and go ahead and do it. The update utility they have looks pretty good.

    In the meantime, any other suggestions would be appreciated :)
  9. scottw182 said:
    No, I've considered that, but I've been putting it off as a last-resort. My last BIOS update with my last board didn't go well. I want the latest BIOS anyway though, so I may just bite the bullet and go ahead and do it. The update utility they have looks pretty good.

    In the meantime, any other suggestions would be appreciated :)


    If you've already updated to the latest drivers and don't have another NIC card, then the BIOS update is the only other resort you have a this point short of reinstalling the OS.
  10. Just did the BIOS update and the first time booting up afterward it did it again. I don't think re-installing would help, I just did a fresh install and everything went smoothly.

    I did an ipconfig /all and noticed something weird this time. For default gateway, it listed 0.0.0.0, and then on an additional line under that, it had 172.16.0.1, which is what it usually is. When I run ipconfig when the network is working, it doesn't display the 0.0.0.0.

    Oh, and I tried ipconfig release/renew but that didn't fix the problem.

    EDIT: To clarify, this is what it looked like:

    Default Gateway.......................0.0.0.0
    .................................................172.16.0.1

    Only, with no dots on the second line, I had to put them there or the forum just pushed the address all the way to the left.
  11. I just checked the properties of the driver and noticed a couple things. First, there is a property called "auto disable gigabit (power saving)", but it was disabled by default. Then, there's "green ethernet" option that was enabled, I disabled that and we'll see if it fixes anything. Didn't see anything else of interest in there.

    EDIT: Under the power management tab, there's an option that says "allow the computer to turn off this device to safe power". It was checked, so I unchecked it.
  12. scottw182 said:
    I just checked the properties of the driver and noticed a couple things. First, there is a property called "auto disable gigabit (power saving)", but it was disabled by default. Then, there's "green ethernet" option that was enabled, I disabled that and we'll see if it fixes anything. Didn't see anything else of interest in there.

    EDIT: Under the power management tab, there's an option that says "allow the computer to turn off this device to safe power". It was checked, so I unchecked it.


    That might be your issue right there. I had the same thing with my previous motherboard (ASUS). My Gigabyte board I have now doesn't seem to have that problem.
  13. Why not use fixed ip settings? Go into your network/sharing center, then select change adapter settings. Double click on your adapter,. The once inside, select iv4 settings properties and plug in the ip address here. If you know the dns server of your isp, that would be even better.

    should be something like

    IP
    192.168.1.2
    255.255.255.0
    192.168.1.1
    DNS
    192.168.1.1
    dns server for your isp (74.129.17.114)

    sometimes the third number #.#.this one.# can vary depending on what kind of router you have. Sometimes it is 2, sometimes 1, sometimes 0


    My experience has been that using autodetect settings can be nice, but eventually, i end up assigning ip addresses to keep things organized.
  14. I finally got it fixed....somewhat. Not really sure what fixed it, but it's working.

    I had downloaded the latest driver from ASUS's website, and trying to update the driver in device manager, which told me that I had the latest driver, but I ran Windows Update and it found a later driver, so I installed that. This, didn't fix things. In fact, it made things worse for a while. After doing that, every time the computer restarted, I had no internet access, so just rebooting wasn't a solution anymore. Sometimes, disabling the network adapter and then enabling it gave me access. I tried rolling back to the old driver, but the new problem of every boot-up remained.

    I started to suspect maybe there was a hardware problem, so I tried different ethernet cables but that didn't help. I tried by-passing my router and just going straight from the cable modem to the computer, but I actually couldn't get internet access AT ALL that way, I'm not sure why. But, I'm pretty sure the router is fine.

    After trying to by-pass the router, I hooked everything back up like normal. I put the latest driver back on there (the one I found on Windows Update), I reset my modem, then unplugged my router and plugged it back in, and it's worked almost 100% since then (for about a week now). The only problem is, if the power goes out while the computer is on (which happens somewhat often where I live, twice this week alone) then I lose Internet access. The first time it happened, I unplugged the modem and plugged it back in, followed by the router, and it went back to normal, even after re-boots. The second time it happened was this morning. I tried just doing the disable/enable method and it worked at first, but, I haven't seen what it does after a reboot.

    Any idea what's going on here? Just a crappy driver and I need to hope for a better one in the near future? That's really what I think it is.
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