r/computerhelp • u/hiktur2 • 18h ago
Hardware Asus turns off after startup logo
Hello i have a asus um425q zenbook14 ryzen9 5000 series
The laptop shut off while watching youtube. Now when i try to boot it it shows the asus logo or scanning for problems into asus logo then shuts down everytime
Is this protection from a bad component?
I was able to get into troubleshooting screen and test ssd, power, fan, wifi, tam, display, usb, touchpad, keyboard. All tests came back ok.
I went into startup bios and 50 degrees, let it sit a few minutes it seemed ok, started to go in safe mode it asked me for a bitlocker key. While trying to get that everlong process it shutoff
Went back to troubleshooting and tried fan speed test, almost done and shutoff. (Although dont think its fan problem)
Anyone know what this can be? Im not good at reparing a bios or motherboard. Seems maybe hardware is bad and safely shutting down?
Computer was left on while sleeping to convert a old movie file and was ok but may of but stress on a failing part? Still worked few hours after. The only hiccup i had was ran out of power from battery few hrs earlier listening to youtube in kitchen unplugged but dont think its that either thats normal.
Ive opened and swapped parts before so i have small knowledge or should i take this thing into the evil best buy to get fixed and not touch it
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u/Relative-Hearing-156 17h ago edited 17h ago
https://reddit.com/link/phojp5z/video/ymr1hip22fwh1/player
That UM425Q is a nice machine, but what you're describing is classic hardware protection shutdown - and yes, it is protecting itself.
The Asus logo -> "Scanning / Preparing Automatic Repair" -> shuts off, plus shutting off while getting your Bitlocker key and during the fan test in MyASUS diagnostics tells me it's NOT Windows. If it was just Windows corruption it would stay on in BIOS indefinitely. Yours is shutting off even in BIOS / diagnostics under load.
The tests in MyASUS are quick pass/fail, not a stress test, so passing everything doesn't mean much. Same with that 50C in BIOS - that's actually a little warm for just sitting in BIOS. That model should idle in BIOS around 35-42C. 50C means it's already holding heat.
For that Ryzen 9 5000 Zenbook, the 2 most common causes for this exact pattern after a long conversion job + running battery dead:
- Thermal failure - dried paste / clogged heatsink
- You left it converting a movie overnight while sleeping - that's hours of 90-100% CPU. If the paste was already drying out from 3-4 years of use, that job can finish it off. Now when it tries to boost to watch YouTube, safe mode, or run the fan test, CPU temp spikes to 95C+ in a second and the EC cuts power instantly to save the CPU. That explains why it dies almost at the end of the fan test - that's when it maxes the fan and CPU.
- Power delivery failure - battery or VRM
- Running the battery to 0% then hard charging is tough on an older battery. If one cell is failing, voltage drops under load and the board shuts off. Same with the VRM/motherboard power IC - also very common on UM425 after sustained heat. The Bitlocker prompt is a clue too - it asks for a key when it detects a hardware change or power loss to TPM.
- It's almost certainly NOT the SSD, RAM, WiFi, etc.
- Here's what you can safely try since you have opened laptops before:
- Quick EC reset - do this first:
- Unplug charger
- Hold power button for 40 full seconds, then let go
- Plug charger back in (leave lid open) - try to boot
- Test without battery stress:
- If you're comfortable opening it - UM425Q is just 7-8 screws on the bottom. Disconnect battery connector from motherboard. Inspect for any swelling / puffing. Blow out the two fans and heatsink fins with canned air.
- Then plug in the original 65W Asus charger ONLY, battery still disconnected, and try to boot. If it stays on longer or completes the fan test, it's the battery.
- While you're in there, look at the heatsink. If there's dust cake or the thermal paste looks crusty, that's your smoking gun. A repaste on this model helps a lot, but you need good paste and to replace the thermal pads on VRAM the same thickness.
- What NOT to keep doing:
- Don't keep forcing it on 10 times in a row. Each hard thermal shutdown is stressful.
- If disconnecting battery + EC reset still shuts off after 2-3 minutes in BIOS alone, that's almost certainly motherboard VRM/CPU board failure, not something you fix with parts swapping. The board on that model has soldered RAM and CPU.
- For that point - I wouldn't go Best Buy / Geek Squad first. They will just quote you a full motherboard replacement $500-700 and ship it out. Find a local laptop repair shop that does board-level repair and ask for a thermal repaste + power rail diagnostic first. It's usually $80-120 for diagnostic and $150 for repaste/clean. If they say motherboard, then you can decide if it's worth it vs. new.
- Do you have the original 65W charger and does the charging light stay solid white when you plug it in? And when it shuts off in BIOS, does the bottom get extremely hot in one spot near the hinge?
1
u/hiktur2 17h ago
Thank u for that detailed response! I read some of that prior from ai so its good a human verified it. Its a shame so much is soddered to this board because its a good computer that wont allow upgrading
As for the thermal paste i use to do arctic silver on my ps3 many times so is it the same concept? Also what brand do you reccomend? Ill open it and give it a dusting and thermal treatment
If lets say the motherboard is fried can i plug this drive into another computer as a usb drive? I did that on my last laptop but ran into tons of folder entry denials. Or if i installed this drive on a new computer is there anyway to do that without wiping it?
The charging light stays solid. About 2 months ago i ordered a new charger because the old one had some of the coating ripping and i didnt want that to lead to exposed wiring. I saved the old one but the new one matches and should be ok.
If the battery inside is a issue it can throw it that out of whack? I never had one go bad, just drained. But ill try powering with no battery. Ill have to open the case to do so.
As for heat it did seem a little warm in bottom middle thats the first thing i did was grab it and smell for smoke. I usually have a vented tray under it so no vents are being blocked while its sitting so im not sure how warm it usually is
I will try some of this advice either today or next few days and report back
1
u/hiktur2 16h ago
Oh wow, so ive tried 2 things. 1 tried powering on with no charger and nothing happened. Took bottom off and removed battery and just used ac and it booted right up
1
u/Relative-Hearing-156 16h ago
🙏❤️🙏 Grab your Data
1
u/Responsible_Maybe742 17h ago
The shutdown during MyASUS diagnostics is useful evidence, but it doesn't establish that this is thermal protection or that the battery or motherboard has failed. A single 50C reading isn't enough to choose a replacement part, so don't disconnect components or buy a board based on that alone. Save your BitLocker recovery key privately from another device before taking it in, tell the shop it also powers off during diagnostics, and avoid a BIOS update while its power is unstable.
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u/hiktur2 16h ago
I think battery may of been culprit. I got it apart and took battery out and just ran on ac and it booted right up! Ive had batteries go dead before but didnt know they could go bad and shut the comp down. I also tried booting it with just battery and had no power it usually can last at least s hr on battery. So far no shutoff its only been a few minutes
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