Hi! A Mac restart loop can feel super confusing because different causes look almost identical (Apple logo → progress bar → reboot → repeat). Before we assume anything, I want to sort it into the right bucket using only safe checks — no “wipe it,” no guessing.

Quick framing (just so the questions make sense): a Mac that keeps restarting is usually one of these:
• a kernel panic / “restarted because of a problem” type crash,
• a startup hang (stuck on Apple logo/progress bar) that triggers a reboot loop,
• a login/startup item conflict (something loads, then it crashes), or
• storage/disk health issues that prevent a clean boot.

First, tell me two basics (short is fine):
1) Is your Mac Apple silicon (M1/M2/M3) or Intel?
2) What do you see right before it restarts — Apple logo, a progress bar, a login screen, or a message about restarting?

That “sometimes reaches login, sometimes not” detail is important. It often means the Mac can boot partway, but something triggers a crash during startup or right after login (a driver-like extension, login item, or even a peripheral).

I’m going to ask in a different order than usual to catch the simple causes first:

1) What changed right before this started — macOS update, new app (VPN, antivirus/cleaner), new printer/USB hub, external drive, or a new monitor/dock?
2) Is anything plugged in right now (USB-C hub, SSD, HDMI, audio interface)?
3) Do you ever see text like “Your computer restarted because of a problem” after it finally boots, or is it just looping forever?

Update timing + a USB-C hub is a classic “looks like the Mac is broken, but it might be a compatibility trigger.” Docks/hubs can cause odd startup behavior if they’re negotiating display/USB power while macOS is booting.

Here are two safe checks that don’t change settings and don’t risk data — they just reduce variables:

Safe check A — Minimal boot environment:
If possible, attempt a boot with everything unplugged (hub, HDMI, external drives, printers, even SD cards). Use only the Mac and its charger. If the restart loop changes (boots farther, or reaches desktop), that’s evidence the loop is being triggered by an external device or accessory path.

Safe check B — Where does it fail?
Try to notice whether it restarts at a consistent point (same progress-bar position) or at random points. Consistent failure points often match a specific boot stage (loading a component), while random can look more like a crash/panic.

That’s useful evidence: removing the hub didn’t “solve” it, but it changed the behavior (reaches login more reliably). That suggests the loop is sensitive to what loads during startup, not just a dead Mac.

When a Mac boot loop happens right after typing the password, it often points to something that loads at login: login items, background agents, security software, cloud sync tools, or system extensions that aren’t happy after an update. It can also be storage-related, but we can test safely without doing anything destructive.

Two quick questions (no need to be perfect):
1) Do you have anything like antivirus, VPN, “cleaner” apps, drive encryption tools, or enterprise management software installed?
2) When it restarts, do you ever see a brief black screen flicker, fan spin-up, or does it feel like a clean reboot each time?

Got it. VPN/security apps are common “after-update” culprits because they install network filters or system extensions. I’m not saying “remove it” here — just that it’s a meaningful lead.

Next safe step is to learn whether macOS can start with the fewest non-essential items. That’s what Safe Mode (Safe Boot) is for: it loads only core components and runs basic checks. If Safe Mode is stable but normal boot loops, that’s strong evidence the cause is software/login items rather than a hardware failure.

I won’t dump a long key-by-key procedure here, but can you try starting in Safe Mode using Apple’s official steps for Apple silicon Macs, and tell me what happens?
• Does it reach the desktop and stay up?
• Or does it still restart even in Safe Mode?

Also, if you ever do reach the desktop briefly, we can check for “restarted because of a problem” logs later — but only after it’s stable enough to stay on.

That’s a big diagnostic win. If Safe Mode is stable, it strongly suggests the Mac’s core hardware and macOS base are OK, and the restart loop is being triggered by something that loads only during a normal startup (login items, background agents, system extensions, or third-party filters). This is exactly how a “Mac computer restart loop confusing” situation usually gets clarified: separate “base system can run” from “something added causes the crash.”

To keep things safe and not turn this into a risky “do 20 things” checklist, I’d focus on gathering a little evidence while you’re in Safe Mode:

Safe check C — What started the same week:
Make a quick list of anything installed/updated around the time the loop began (VPN app update, antivirus, display driver utilities, menu bar tools). You don’t have to uninstall anything yet — just identify suspects.

Safe check D — Does it fail before or after login?
Since you said it often reaches the login screen, the “restart after entering password” detail points at your user environment (login items) more than the system boot stage. That helps narrow where to look later when it’s stable.

One more question: do you have more than one user account on this Mac (like a guest or a second user)? Sometimes that can help isolate whether it’s tied to one account’s login items.

Perfect — multiple accounts can be a safe “is it just my profile?” test. Without changing anything major, you can try a controlled observation: if the Mac can boot normally and stay up when you sign into a different account, that would strongly suggest your main account has a login-item/background agent conflict. If it still loops no matter which account, the cause is more system-wide (extensions, network filters, or update fallout).

Also, if you ever see the message “Your computer restarted because of a problem,” that’s typically a kernel panic report — and the report itself can help a technician confirm whether it’s tied to a specific third-party component. We don’t need to interpret the full report here; just knowing whether it appears is useful.

Safe summary of where you are right now:
• Safe Mode works → base macOS can run.
• Normal boot loops → something loads in normal mode that triggers the restart.
• Timing matches macOS + VPN updates → software conflict is a top suspect, not a “dead Mac.”

If you want, tell me whether normal boot behaves differently when you log into the guest/second account, and whether you ever get the “restarted because of a problem” message. That will narrow the cause without any risky changes.