Solved mainboard beeps frequently blank screen and turns off and on

September 1, 2016 at 18:17:06
Specs: win7, core i2
When i turn the power on the main board starts to beep frequently (short beeps about 24 beeps at each period) and screen is blank and system turns off automatically after approximately 30 seconds and turns on again after 10 seconds and all of above process repeat frequently .
I've tried with another cpu , was not successful.
My graphic card and rams seems to be healthy.
I've cleared bios by jumping and removing battery both but was not successful . Could you help me ?

See More: mainboard beeps frequently blank screen and turns off and on

Reply ↓  Report •


✔ Best Answer
September 3, 2016 at 05:53:11
"Its maximum output power is 300w"

That's pretty low by modern standards. You didn't bother to post the make/model of ANY of your hardware other than the motherboard. We have no idea which CPU, which graphics card, how much RAM, how many HDDs, etc. There is no such thing as a "core i2" but based on your board which is a S775, you probably have a Core 2 Duo or Core 2 Quad.

The beep code is the key & you stated there's repeating short beeps - that indicates a power problem. Wattage requirements vary depending on hardware configuration but the PSU will only supply what is needed, so if your system only requires 250W, having a 1000W isn't a problem as it will only produce 250W. Having a 300W unit might be a problem because it could be running at or over max capacity, depending on the unit's efficiency.

Since you didn't post the PSU info here's what you should generally look for in a decent quality unit:
- 400W minimum
- single +12v rail at 30A or more. Units with multiple +12v rails should be avoided.
- +3.3v & +5v rails at approx 20A each. If the +5v is significantly higher, you have an outdated PSU based on an older ATX standard
- active PFC (power factor correction)
- 80 plus certified (efficiency)

Here is an example of a well spec'd Corsair 430W unit: http://www.newegg.com/Product/Produ...

And here's a poorly spec'd X-tec 400W unit: https://3dprinting4u.files.wordpres...

EDIT: another possible cause of restarting could be the heatsink is installed incorrectly on the CPU. Most CPUs are very fussy about thermal paste application. Too much, too little, or improper placement (ex. horizontal line used when vertical line is required) can prevent a system from starting. Make sure you applied the paste correctly for your CPU.

http://www.arcticsilver.com/intel_a...

message edited by riider



#1
September 1, 2016 at 18:26:23
And so ...
i checked all of the output voltage of my psu by a multimeter at the turned-on state and all voltages were correct . So it could not be the psu fault .

Reply ↓  Report •

#2
September 1, 2016 at 18:33:54
MB model?
Do you have the cpu cooler installed correctly?
Use only one memory stick at the time.
Disconnect any drive or USB device. Just bare MB.
Even remove the graphic card and see what changes.
.....

Reply ↓  Report •

#3
September 1, 2016 at 18:45:05
Thanks.
I did do all that you said . But have not any change and problem still remains .
Mb model : gigabyte - ga-ep41t-ud3l

message edited by hamidmaj


Reply ↓  Report •

Related Solutions

#4
September 1, 2016 at 20:29:26
The beeps are a code that gives information about the problem. You need to check the beep codes for your motherboard. They should be in the motherboard manual. Once you find what the codes say you should have an idea where to start.

Here's a link to the manual:

http://download1.gigabyte.ru/manual...

Check page 80.

message edited by DAVEINCAPS


Reply ↓  Report •

#5
September 1, 2016 at 22:40:20
According to the manual:
http://download1.gigabyte.asia/File...

Q: What do the beeps emitted during the POST mean?
A: The following Award BIOS beep code descriptions may help you identify possible computer problems.
(For reference only.)
1 short: System boots successfully
2 short: CMOS setting error
1 long, 1 short: Memory or motherboard error
1 long, 2 short: Monitor or graphics card error
1 long, 3 short: Keyboard error
1 long, 9 short: BIOS ROM error
Continuous long beeps: Graphics card not inserted properly
Continuous short beeps: Power error

What exactly are you hearing?

message edited by sluc


Reply ↓  Report •

#6
September 2, 2016 at 07:26:00
I know . But it's not by power supply's fault . As i said i've checked all of output voltages by multimeter and they were correct. Its switching process works correctly too.

Reply ↓  Report •

#7
September 2, 2016 at 08:31:30
You're hearing continuous short beeps which means it's a power problem.

"As i said i've checked all of output voltages by multimeter and they were correct"

Just because the voltage rails are within spec doesn't mean the SMPS is capable of delivering the proper amperages. I'm going to guess you're from India. Unless you have a reliable brand name unit (Antec, Corsair, Seasonic, Thermaltake, etc), the cheap brands sold in India (iBall, VIP, Zebronics, etc) are garbage.

Please post the make/model & wattage of your SMPS.

BTW, besides the beeping, random restarting is a sign of a weak or bad SMPS.

message edited by riider


Reply ↓  Report •

#8
September 2, 2016 at 13:30:10
Thank you my friend
Im from iran of course ,
Maybe your right .
Its maximum output power is 300w.
I've checked the maximum current pulled up from power supply by the multimeter at main fuse socket and this current was enough (20 A)
Of course it dosen't mean that all of outputs current sources feeds the main board by the recommended magnitude . But i still think it could not be the power's fault .

Reply ↓  Report •

#9
September 2, 2016 at 13:57:00
It's easy enough to check. Swap in a higher wattage/better quality power supply and see if the problem goes away.

Reply ↓  Report •

#10
September 2, 2016 at 15:29:21
Thanx .
It's an examination project , and i should find the problem and repair it by my own .
I haven't reach any factory or another alternative pieces to test .

message edited by hamidmaj


Reply ↓  Report •

#11
September 2, 2016 at 17:16:54
If the power output voltages is OK than my suspicion goes to the Motherboard.

Reply ↓  Report •

#12
September 2, 2016 at 18:26:12
If the PSU were unable to deliver sufficient amps then the output voltage would fall. I'm with sluc on this one, the motherboard is suspect.

Always pop back and let us know the outcome - thanks


Reply ↓  Report •

#13
September 2, 2016 at 18:52:27
The power supply has to provide adequate current at several different voltages. Did you check all the voltages:

http://www.smpspowersupply.com/conn...

https://www.pctechguide.com/how-to-...

Are all the psu--motherboard connections attached and making good contact?

I'm not sure what an 'examination project' is but if it's some kind of test of your repair abilities then maybe those who assigned you the project have deviously modified it to not work in a particular way.

You're getting a bios code indicating a power problem so that's where you start and it must be where they expect you to start.


Reply ↓  Report •

#14
September 2, 2016 at 19:43:47
If you like to dive into the MB power hardware:
http://www.hardwaresecrets.com/ever...

Reply ↓  Report •

#15
September 3, 2016 at 05:53:11
✔ Best Answer
"Its maximum output power is 300w"

That's pretty low by modern standards. You didn't bother to post the make/model of ANY of your hardware other than the motherboard. We have no idea which CPU, which graphics card, how much RAM, how many HDDs, etc. There is no such thing as a "core i2" but based on your board which is a S775, you probably have a Core 2 Duo or Core 2 Quad.

The beep code is the key & you stated there's repeating short beeps - that indicates a power problem. Wattage requirements vary depending on hardware configuration but the PSU will only supply what is needed, so if your system only requires 250W, having a 1000W isn't a problem as it will only produce 250W. Having a 300W unit might be a problem because it could be running at or over max capacity, depending on the unit's efficiency.

Since you didn't post the PSU info here's what you should generally look for in a decent quality unit:
- 400W minimum
- single +12v rail at 30A or more. Units with multiple +12v rails should be avoided.
- +3.3v & +5v rails at approx 20A each. If the +5v is significantly higher, you have an outdated PSU based on an older ATX standard
- active PFC (power factor correction)
- 80 plus certified (efficiency)

Here is an example of a well spec'd Corsair 430W unit: http://www.newegg.com/Product/Produ...

And here's a poorly spec'd X-tec 400W unit: https://3dprinting4u.files.wordpres...

EDIT: another possible cause of restarting could be the heatsink is installed incorrectly on the CPU. Most CPUs are very fussy about thermal paste application. Too much, too little, or improper placement (ex. horizontal line used when vertical line is required) can prevent a system from starting. Make sure you applied the paste correctly for your CPU.

http://www.arcticsilver.com/intel_a...

message edited by riider


Reply ↓  Report •

#16
September 6, 2016 at 12:34:38
Is the problem fixed? If so what was the fix?

Always pop back and let us know the outcome - thanks


Reply ↓  Report •


Ask Question