Are the major components (computer, box, UPS) on the same circuit?
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You said the interference happens while booting the computer... is that when the computer's BIOS starts looking for a boot device? Or a bit after Windows/Linux/whatever is loading? If it happens prior to or just as the PC starts booting it's possible the BIOS is looking for an "Ethernet boot" or "network boot" source which can spew a fair bit of gibberish onto the Ethernet line. In the old days, the PC BIOS boot devices were typically 1) diskette, 2) CD-ROM, 3) Hard disk. Now though boot devices can include USB ports and the Ethernet interface. Go into your computer's BIOS - pressing F2, DELete, F1, whatever the "magic" key to enter SETUP mode happens to be on your computer. Check the motherboard/computer manual for details, or watch the screen during the BIOS test cycle (if it displays one) for a message like "Press Y to enter SETUP."
Somewhere in the SETUP settings, typically on an Advanced Setup page, will be the boot devices and boot order. Disable Ethernet/Network boot especially if it is listed ahead of the hard drive as a test... see if your interference goes away.
Note: for Windows 8, a "shutdown" is typically just a deep standby mode and a new/modern style UEFI BIOS (UEFI is a new standard that inter-operates with Win 8 for faster bootup) may not even give you a chance to enter SETUP. You need to do a "hard" shutdown and then restart the computer. On some computers that means holding the SHIFT key down while you click the shutdown icon - and hold SHIFT down the entire time. It varies from manufacturer to manufacturer. Or make your own desktop "full shutdown" icon with the target/program set to "shutdown.exe /s /f /t 00" and double-click it. Your next boot-up will be much slower (about as fast as a WinXP or Win7 system) after a full shutdown. Boot-ups will be Win8-quick when you use Win8's default/normal shutdown instead of the "full shutdown" - don't worry - we're not going to make all future boot-ups slow!
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