Can a power supply unit harm a motherboard within three hours?
Can a power supply unit harm a motherboard within three hours?
The only instances I've encountered with damaged Ethernet cables were those subjected to physical stress—such as bending, stretching, or crushing. I haven't observed any damage from high voltage exposure, aside from lightning strikes, when conditions are uncertain.
As an EMC systems engineer, I incorporated ferrite beads onto various cables (keyboard, mouse, monitor, USB, mains, network, etc.) to minimize electromagnetic emissions (Radio Frequency Interference) generated by these connections. Computers naturally produce noise and tend to impact more delicate devices nearby, like radio receivers and poorly suppressed audio amplifiers.
Unless a high-power radio transmitter antenna is positioned very close to an Ethernet cable, it's unlikely to generate enough voltage in the four twisted pairs (especially in well-made cables) to surpass common mode rejection and disrupt data transmission. Significant voltage levels—typically tens of Volts per metre at specific frequencies—are uncommon outside EMC testing environments.
Ethernet cables are designed with two layers of insulation (one around each wire, another as the overall sheath), so additional isolation tape isn't necessary. You wouldn't need to apply substantial electrical stress to break down the insulation and cause lasting damage.
In my lab, I often conducted tests where I applied an 8kV electrostatic discharge to equipment's exterior as part of routine commissioning. I never experienced any failures. Unless you're near a Van de Graaff generator or experiencing a thunderstorm, it seems your issue isn't related to Electrostatic Discharge (ESD).
Have you replaced the NIC with a high-quality PCIe card in place of the potentially unreliable 2.5Gbps Ethernet chipsets on some motherboards? I've discontinued 2.5GbE mobo NICs and switched to premium 1GbE ex-server Intel NICs or 10GbE NICs with optical transducers.
The forums are filled with users who've encountered problems with inexpensive Intel and Realtek 2.5GbE mobo chipsets. The Ethernet chipsets in many mobos cost just a few dollars and often have design flaws or unstable drivers. Server NICs can run into the tens of dollars and usually offer better performance with fewer interruptions. Drivers also significantly influence network stability.
One ISP I used ten years ago intentionally limited bandwidth for anyone using an excessively large share of their "valuable" bandwidth. They argued it wasn't fair to others. If you attempted to download gigabytes over several hours, my ISP reduced your download speed to 25%. When you stopped abusing the ISP's limited capacity, they restored full download speeds after two hours—without completely cutting the connection. It seems they wanted you to use less bandwidth.
Over the past year, I've experienced intermittent internet issues due to:
1) A system outage on the fibre-to-the-premises backbone leased by my ISP (can last hours but is rare).
2) Slowdowns or shutdowns on individual PCs when a VPN malfunctions. This affects only devices on the same network; it's from a low-cost VPN provider.
3) Sluggish performance across all PCs after the pfSense hardware firewall has been running continuously for over 30 days. Restarting the firewall resolves the issue.
4) Driver-related problems—updating NIC drivers can sometimes help.
5) Using 2.5GbE NICs on two motherboards; the problem was resolved by switching to better NICs.
None of these disruptions stemmed from unreliable Ethernet cables, though I did face issues when using certain Cat 8 leads on my 10G LAN. The RJ45 connectors exhibited intermittent connections in my network switch, and the cables felt stiff. Switching back to more flexible Cat5e and Cat6 cables resolved the problem.
As @Ralston18 advises, avoid using aluminum cables—sometimes installed in partition walls for cost savings—and be cautious with copper-plated aluminum patch cables, which can also cause problems. Opt for 100% copper construction instead; it's pricier but more reliable.
Did you reinstall Windows after swapping the motherboard? That’s a vital part and can lead to driver issues in Windows.
Can a damaged RMA 850x harm a motherboard? The answer is rare unless the cables were incorrectly connected.
The disconnection might stem from a faulty modem or router—there seems to be quality problems, especially with high-end models that include a laptop cooling fan beneath them to prevent thermal throttling.
Make sure you update all your Wi-Fi drivers and motherboard chipset drivers.
Additional steps:
Proceed with these actions
Step-by-step guide
Launch Command Prompt as Administrator
Type “Command Prompt” in the Windows search bar.
Right-click the app and choose
Run as administrator, then click
Yes
to execute the commands:
- ipconfig /release
- ipconfig /flushdns
- ipconfig /renew
- netsh int ip reset
- netsh winsock reset
- restart pc
After reboot, run ipconfig /release to release your IP address, ipconfig /flushdns to clear DNS cache, ipconfig /renew to get a new IP, netsh int ip reset to refresh the TCP/IP stack, netsh winsock reset to refresh the Winsock library.
Also consider replacing your phone line filter—adsl connections should be updated every three months.