|If you changed which ram you have installed, you may have installed ram that is not 100% compatible with the mboard. Incompatible ram can cause unexplained rebooting, or NO BOOT AT ALL. If you know which ram worked fine in this mboard previously, install only that ram while troubleshooting.|
It is easy to test for whether incompatible ram has caused your mboard to fail to boot, or it's caused by another problem.
Make sure you have a speaker or speakers connected to the mboard so you can hear mboard beeps (see your mboard manual).
Remove the AC power to the case/power supply.
Remove all the ram.
Restore AC power.
Try to boot.
If nothing else is wrong, you will hear a pattern of beeps that indicate no ram is installed, or a ram problem.
E.g. for an Award bios or a bios based on one, that's often a beep of about a half second, silence for a half second, a beep of about a half second, silence for a half second, continuously.
A common thing that can happen with ram, even ram that worked fine previously, is the ram has, or has developed, a poor connection in it's slot(s).
This usually happens a long time after the ram was installed, but it can happen with new ram, or after moving the computer case from one place to another, and I've had even new modules that needed to have their contacts cleaned.
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
The power supply must have enough capacity to handle your system when the graphics card you are using is installed. Go to the web site of the manufacturer of the card model - if the graphics chipset requires more than a minimal power supply, the minimum wattage capacity the PS must have, and often the minimum current the PS must supply at a certain voltage, is often stated in the specs for the card somewhere, often under System Requirements.
It sounds like your original power supply was failing.
It could be your replacement power supply is also failing.
Failing power supplies are common and can cause your symptoms.
Check your PS.
See response 4 in this:
Make sure all the USB controllers are enabled in the mboard bios setup pages.
"plug in another spare USB port to the motherboard "
If you mean you connected a wiring adapter(s) to (a) USB header(s) on the mboard so that you have two or 4 USB ports available on (a) plate(s) that install(s) in a slot space
- which pin is for what on the mboard USB header, and how one piece wiring connectors for the mboard header or 4 in a row or 5 in a row wiring connectors are wired for the wiring adapters, was never standardized. If the wiring adapter came with the mboard, it will be compatible with the way the pins in the header are wired, but if it didn't come with the mboard, the wiring of the female connector(s) from the wiring adapter must match the wiring to the pins on the mboard USB header. If the USB header is wired up wrong, you won't notice anything is wrong until you connect something to that USB port.
In that case plugging in something usually doesn't hurt anything - it just doesn't work.
- the wiring for the 5th pin for a port on some mboard USB headers is not compatible with the 5th wire on some female connectors from the USB wiring adapter. In that case you will probably get messages from the mboard about an overcurrent condition or similar. In that case you need to NOT connect to the fifth pin for the port on the mboard header.
E.g. if you have a 5 in a row and a 4 in a row female connector from a USB wiring adapter(or from front USB ports in the case, etc.) you can often install the 5 in a row connector on the 4 pin side of the mboard header so the 5th wire has no connection, the 4 in a row connector on the 5 pin side of the header so there is no connection to the 5th pin.
- some mboards have headers for firewire connections that have an identical pin layout to those for a pair of USB ports. E.g. Asus mboards.
If you have headers for both MAKE SURE you connect to the right one!
If you connect the wiring for a USB wiring adapter to the header for a firewire connection, or visa versa, you won't notice anything wrong until you plug in something into the port. When you DO plug some device into the adapter port that's connected to the wrong header, the firewire circuits or the USB circuits will be damaged in a short time, and the device you plugged in may be damaged in a short time as well.
" the USB mouse and keyboard plugged into the front USB ports aren't working. I open the case and the front and try different plugs, and plug in another spare USB port to the motherboard and can't get anything."
"Only the back ports had issue after the swap, but the front still worked fine."
You can have problems with USB ports if the power supply is failing, but in that case, if you DO have that problem NONE of the USB ports will work properly.
You may have problems with USB ports that are NOT directly connected to the mboard:
See response 3 in this:
All the physical built in USB ports directly connected to the mboard should work.
If some don't you may have the bad capacitor problem.
Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .
This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:
What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.:
We have also heard of rare cases where something damaged some USB controllers built into the mboard, or all of them.
- a failing power supply damaged the mboard
- a power spike or surge, usually associated with a power failure, or a lightning strike close to your location or on the power grid near you. Lightning can cause damage even if your computer, and everything connected to it that plugs into AC, and the cable that connects you to the internet, is plugged into something that protects it from power spikes and surges - the computer does not have to be running at the time, and the AC power to the computer case does not have to be on - if the computer is merely plugged in it can be damaged.
- a static electricity discharge. E.g. DO NOT vaccum anything inside the case!! Vacuum cleaners produce a tremendous amount of static electricity when running and touching anything connected to it to the computer can release a static electricity discharge.
"I have an additional USB that plugs into the MB like the front, and mounts in the rear PCI-slot bracket. It has LEDS on it and they lit up orange, blinked, turned green as if they were working properly
USB wiring adapters normally do NOT have any leds for the USB.
Some mboards, e.g. some MSI models, come with a special USB wiring adapter plate that also has diagnostic leds for the mboard on it - in that case it has a one piece wiring connector for the USB, and another one piece wiring connector for the diagnostic LED display . The wiring connector for the diagnostic leds plugs into a specific header on the mboard. The led display pattern has nothing to do with the functions of the USB port on the same plate. If you're not sure whether that special plate is meant to plug into your mboard DO NOT plug in the connector for the diagnostic leds!! You certainly DO NOT plug in the connector for the diagnostic leds into anything but the header for the diagnostic leds! The other wiring connector for the USB ports will work with your mboard USB header, if it came with the mboard, or if it didn't come with the mboard, IF and only if the wiring of the ports on the plate is compatible with the wiring of the pins on the header.