Question about Computers & Internet
No display, no light on keyboard... pls help me.
First thing to check with a desktop computer problem is the Power Supply.
This I state a lot.
In reality there's a flaw.........
In reality a person should visual check for bad capacitors on the motherboard, then move to the Power Supply.
The AsRock Conroe865GV uses nothing but Electrolytic Capacitors.
(Radial Aluminum Electrolytic Capacitors to be exact)
Doesn't use any Solid Polymer Capacitors.
These are known to be a 'weak link' on a motherboard.
Capacitors are used as Filters, and Voltage Regulators, on the motherboard.
The ones used as voltage regulators are in the Motherboard Voltage Regulator Circuit,
Just thought you might like to know
Since you indicate the CPU fan is spinning, I assume you know the computer isn't supposed to be dirty inside.
If you don't............we need to have a long talk..........
With a Power Supply having a weak voltage power rail, you may see LED's light, and maybe fan's spin, but there won't be enough power to turn the CPU (Processor) on.
1) If ALL of the LED's were on at once, they would use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts of power.
3) A typical CPU (Processor) can use 51 to 130 Watts. Just depends on what CPU it is.
The motherboard chipset is an Intel 865GV chipset,
Can support Intel Pentium 4 HT, models 620 through 672; for ->one.
They can use Up To 115 Watts,
[ AsRock Support states the Conroe865GV will support Intel Core 2 processors, but I don't believe it.
It isn't until you get to the Intel 945G, that Core2 support is picked up.
Just my 2 cents ]
High voltage AC electricity comes into the Power Supply, and is contained in it's metal case.
The AC voltage is converted into low DC Voltages.
3.3 Volts DC, 5 Volts DC, and 12 Volts DC.
In comparison two D cell flashlight batteries produce 3 Volts DC.
A multimeter is used to check the three voltages.
Need guidance with this post back in a Comment.
[An economical multimeter around here, can be purchased for around $5 to $12.
Available in a lot of stores. I have seen them on checkout aisle racks, of major discount stores ]
Use a KNOWN to be good, Compatible power supply for a test unit.
May be a working computer that is not being used, that you can Temporarily borrow it's power supply.
Let's start the diagnosis from here..........
Post back in a Comment
Posted on Apr 18, 2013
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Posted on Jan 02, 2017
The first board may be bad; the detection of input devices is done by chips other than the uProcessor.
The second board may simply be controlling the fan speed according to need and when first powered up, the processor isn't hot.
Posted on Aug 28, 2008
Obviously, it could be a transcient error or what we call the soft error. There could only be two culprits if you encountered this kind of problem. One is, it could be the power supply. If the power supply is faulty the electricity that flows within it (which is AC converted to DC)could have a lower or higher amount of electricity instead of a normal rate.
But if your PSU is working properly ( you could check it by swapping the PSU to another system unit ) then it could be the MOBO. According to standard IBM POST error codes, no beeping sound could be a faulty PSU or MOBO. It is more practical but to replace the MOBO, but still you could use the memory, videocard, HDD and other devices.
Posted on Sep 05, 2008
Try cleaning the RAM as shown in the image below:
also you can try resetting the CMOS, here's how it's done on your motherboard:
CLRCMOS0 allows you to clear the data in CMOS. The data in CMOS includes system
setup information such as system password, date, time, and system setup parameters. To
clear and reset the system parameters to default setup, please turn off the computer and
unplug the power cord, then use a jumper cap to short the pins on CLRCMOS0 for 3
seconds. Please remember to remove the jumper cap after clearing the CMOS.
The location of the CLRCMOS0 on the motherboard can be seen on the image below. (labeled no.10)
If problems persist. Replace the RAM. Hope this helps.
Posted on Oct 08, 2009
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