Power On Self Test, a routine that a device runs immediately after turning on.
Questions tagged [post]
309 questions
23
votes
5 answers
Why does pulling the power cord then pressing the power button fix a non-booting PC?
I've been working at this institution for about 6 years. One thing thing that I've always found curious is that sometimes—especially after a power outage—we find a PC that won't boot when the power button is pressed. Usually, the fans will spin up,…
Justin Force
- 282
17
votes
3 answers
Why can the time between power on and the beginning of POST vary?
In over 20+ years of using computers, I have always noticed that after some time from power on, the motherboard emits the usual single beep to say that everything is okay and the POST begins. This time clearly depends on the MB model, but usually is…
Mark
- 656
14
votes
5 answers
Do POST beep codes also generate a numeric code for a POST test card?
My wife is an American Sign Language interpreter. She is currently interpreting for a student in a computing class. Today they were talking about BIOS and POST beep codes and the student asked the instructor if there is any way they could get the…
nourse
- 163
5
votes
2 answers
Laptop freezes before/during post
I have an Asus K70AB which has had an issue for a while. When it boots, there's a chance it'll freeze for an indefinite time before it seems to start doing anything. What it will do is:
The lights turn on, the fans start rotating and the CD drive…
Patrickdev
- 151
5
votes
2 answers
Motherboard won't post after electrical storm
An electrical storm hit earlier and has taken out my phone line, router and a PC. Both PC and router were plugged into a surge protector.
The PC no longer POSTs. I've swapped out the PSU to no effect, it does power on it just doesn't beep.
I…
bcmcfc
- 601
5
votes
2 answers
Computer shuts down immediately after posting on second start
Symptoms
This is on a system with just PSU, motherboard, CPU, case speaker, one stick of RAM, and display.
Gigabyte Z97 Motherboard
Intel i7 4790k CPU
Cooler - CoolerMaster RR-212E-20PK-R2 R
PSU - CORSAIR | CX750M 750W R
RAM
4 GB OEM RAM from an…
Cosine
- 53
4
votes
2 answers
My PCIe video card does not work in POST, only comes on when Windows loads
I have an ASUS Maximus V Extreme motherboard which has onboard video. There is an Asus GeForce GTX 670 in PCIe slot 1.
In the BIOS, I have PCIe selected as the preferred GPU. I've tried disabling Fast Boot and other items to attempt to get the…
4
votes
2 answers
System Works Fine but only after Very Long BIOS POST Times?
I built this AMD XP64/XP32 system in November 2008. It runs well, but it does not start well. Windows Restarts are fine, but cold starts average 4-5 minutes to POST, with the record-holder so far being more than 48 minutes. I have had a number of 20…
Greech
- 81
4
votes
2 answers
Acer Revo R3600 Won't POST
I powered off my Revo this afternoon to change the power strip, plugged in a second USB hard drive and booted it up, only to find the machine won't POST. It's been running happily as an HTPC for at least 9 months and has been rebooting fine. I've…
Gargravarr
- 289
4
votes
3 answers
What are the possible causes of a not-booting motherboard with drdebug 00 code?
I have pursached a new Asrock Z68 Extreme4 motherboard with an i7 2600K and 2x4GB ADATA DDR3. My problem is that it doesn't boot or beep, and the onboard drdebug led constantly displays "00" - which is according to the board's manual, "not used".…
Dutow
- 163
4
votes
1 answer
Laptop won't boot after alcohol spill
So I just had a minor spill and let everything dry out. Now when I try to boot my laptop, I get one or two beeps on the BIOS splash screen before the laptop shuts down. I can't get to the post screen so I'm not sure what the error is.
I'm sure that…
Gio Borje
- 395
4
votes
10 answers
Motherboard won't power-on until it rests for ~10min with no power plugged in
I have a strange ASUS Rampage Formula motherboard issue.
When the computer is off — I can't power it on: 'Power' button press gives just a short impulse on fans. When I disconnect the power cable and try again — nothing happens. The LCD says 'CPU…
kolypto
- 3,121
4
votes
3 answers
can't boot new computer
I got such a great response from Wil and Dan on my last problem I want to try again. I am trying to boot my just built computer for the 1st time and all I get is a continous beep which sounds like a machine gun. The MB is a new Gigabyte GA P55…
Robert Wooley
- 51
- 1
4
votes
2 answers
After working for over 4 years, a custom PC won't POST
Configuration:
CPU: Intel Core i7-4790K
Motherboard: ASUS Z97-A ATX DDR3 2600 LGA 1150
RAM: Crucial Ballistix Sport XT 16GB Kit (8GBx2) DDR3 1866
PSU: Corsair RM750
When I turn the PC on, the CPU fan turns on for about one second. Also, the EZ XMP…
user1566515
- 273
4
votes
1 answer
Connecting a hard disk causes computer to not even POST
As a power user and a long time computer enthusiast, I'm flabbergasted by this problem. I've seen many things in my lifetime, but this one is new to me.
This is a long post, but an interesting problem.
A friend of mine asked me to fix his computer…
