Motherboard problem Dear Sir, I have a EP-3VWM+ motherboard. My system boots ,but stop and ask press F1 to continue. But my system could'n detect the keyboard. I have tried both USB and Ps/2 keyboard both failed. Please help

check the cable
make sure the hd is getting power
try another sata connection by swapping the cable from dvd device
make sure you set the drive select some drives require it
do not use cable select
make sure the battery back up has 3 volts
you could try shorting out the bios to reset the motherboard - there should be a jumper on the board, turn power off, the jumper or connect the two pin so the short out, than turn on machine, just for few seconds and turn off, remove the jumper.
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before or when booting the system push F10 to access bois
setup all devices, dvd, video card, if that dont work you can try F1 or F2 when you start the system
when you exit the bios make sure to save it i think F10 save and reboot. so save new changes and device ID.

It's very possible that your hard drive is dead. If you get a prompt when booting it such as F1 then the motherboard is working (so far), therefore it means the BIOS is ok and also that your CPU is ok if not nothing will show on your screen. If pressing F1 gives you boot options then select CD. If it won't boot from your CD force it by actually going into BIOS setup and selecting CD as primary boot drive then press F10 to save. (if BIOS setup options don't show when booting try pressing F10 or F8 and any other function keys after F1.
Make sure you have the installation disk. If the PC still doesn't boot or detect it you should try another CD/DVD drive, yours might be bad or buy or borrow a DVD/USB external drive and select it as boot drive in BIOS. Often I've seen that when booting if either the hard drive is bad or your operating system is corrupted it will prompt F1 because it cannot detect either. If OS is corrupted you will be unable to get to safe mode especially if the hard drive is bad, the recovery partition is on that hard drive and safe mode is a Windows program not BIOS.
After you've tried connecting a different CD drive to install your OS you should be able to at least see the Windows installation or whatever operating system you use asking to begin installing. If the installation fails then we move on to the hard drive; take it out and put a new one then try again.
If none of these help then there might be a circuit shorted out on the motherboard which can cause some things to work but not others although this is rare. Lastly I don't know what you meant by USB in your question because unless you have a bootable USB drive the system isn't going to do anything with it anyway.
By the way someone here mentioned RAM memory. BIOS should still show even if your memory is gone but some systems are quirky so this needs to be tested as well. I could go further if you had posted your system's specifications such as how many sticks of RAM you're using. Try dusting off your the inside of your computer with compressed air. Dust acumulation tends to cause weird behavior on a computer.

Your Hard Disk Drive is crashing or has crashed. You need to buy a new hard disk drive, and then you will have to reinstall windows and start over.

first try to notice the message before the (press F1 to continue) message, it could be a bad component (memory, hard drive, etc...) or the time & date is not set correctly in the BIOS, this would help a LOT thank's...

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error hope this helps

Hit F2,look in setup to see if the hard drive is recognized and check that the date and time are correct.
Then hit esc key. it will ask if you want to save changes, click yes. It should boot and probably ask you to hit F1 or F2 again., unless there is a problem with the CMOS battery, which may need to be replaced.
If you hit F1 to continue, it will boot, but your time and date will be off.

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Your operating system corrupted, so please reinstall your OS. and please detected all devices on bios system. 

This message is usually accompanied by another more explicit, like: "Memory changed from 1GB to 2GB. Press F1 to continue". The message should display and go away after pressing F1. Since you cannot press F1 because the keys do nothing, chances are your keyboard is disconnected, which should display a message indicating this failure.
Try pressing the ScrLk (Scroll Lock) key as messages are being displayed to catch all
messages (they go by quickly) and stop them before they disappear.
If that's the case, then reconnect the keyboard and try again.
Good luck!

The 'Press F1 to continue" message is a result of an error caused as the BIOS does its hardware checks during the boot process.

The BIOS boot process (bootstrap) preceeds the loading of the operating system.

The most amusing example of this occurs if you unplug a ps2 keyboard, 
1, it generates the error
2, pressing F1 does no good because the keyboard is not plugged in.
3, if its ps2, you will need to do a hardware reset after plugging the keyboard in again.

The bios can be set to 'halt on'
'no errors' which will stop the error message appearing.
'keyboard errors' see above
'all errors' any hardware failure detected by the bios will halt the boot process and give the above message.

hi there,

did your system to press F1 to continue. not try to go on BIOS setup. on booting process press F2 or Delete tab. and then click on safe mode if the booting will continue to run. come up a confirmation if you continue in safe mode click yes. and then work on that system for a couple of minutes, and then restart you pc.

you have too many start up programs. that why it will freeze during start up.