I'm in Iraq, trying to set up a VSAT network for a group of soldiers. I have the sat system working fine. I ran cat5e to several locations, when I hook up any location farther than 40 feet from the switch, the lights on their NIC card and on the switch will blink on then off very slowly. The computer on other end will flash the notification that a network cable is unplugged. Is this my cable? I have tested the cable with a pin tester that cycles through all 8 pins on both ends to confirm you attached rj45 properly, according to this I get signal through the wire, it just might not be strong enough or maybe there's interference. This has happened with five different cables. I'm using cat5e utp
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you need either a "crossover" cable or both plugged into an ethernet switch, with network settings the same but i.p. addresses off by 1 digit. eg. 192.168.1.3 on computer "a" and 22.214.171.124 on computer "b".
if your system is still within warranty I would think twice about opening the case yourself to installing a new network card.. you will be voiding your warranty.. so think about it
another thing i would try before deciding on going for another network card is to check your onboard network adapter has updated drivers... or you may want to reinstall the drivers for that adapter.. either one of those may probably fix your issue assuming is not a hardware failing given that your system may not be that old.... make sure you check the windows update and look for any new hardware driver for your network adapter that may be avaliable through windows update.
before you install your new network pci card you may have/want to disable the one on board going into your bios for that. so to ensure there's no resource conflicts when installing the driver for your new card (it may not be a problem even if you don't but if you run into problems while installing the new card consider this suggestion)
I found one of these printers in a parts bin and it looked like it was in great condition so I said what the heck, I'll try it out. Had the blinking light problem and figured it was a nic card because all functions via USB worked fine. If I plugged in a network cable, it froze up all functions except the LCD menu.
Took off the side panel and low and behold, it had taken a bad fall and the NIC card's connector to the main borad was busted. The main borad was fine though so it does everything fine via USB. Its a modulear NIC card so replacing it would probably work, but the chance of finding a replacement NIC card for the printer? Slim to none, it doesnt even have a model number. Only if I come across another one of these printers. Oh well, sweet printer for free, even if it only works via USB.
make sure u r in same work group,remove and instal in other pci slot and try,check cable connections up to server ,instal a antivirus progarm and scan ,if u are adwanced user u can use dos mode antivirus programes firstname.lastname@example.org