I have a 741gx-m motherboard and the problem is that when i start the computer the cpu fan,the video card fan run and the chassis fan ran, but the system bios won't read or even the hdd doesn't read at all. what's should be the problem of this computer. pls do answer back. thanks!
Try to unplug unnecessary hardware.. just plug in the monitor to video card, power, and the memory.. unplug the IDE cable or SATA and also the USB devices... Observe if your system will boot. sometimes hardware damages prevent your system to boot..
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Could be 3 things Memory or CPU or Powersupply. are you getting any beeps if so how many, how long. try taking all the memory out and powering up see if it beeps if so try to put one stick of memory in at a time and see if it will boot. if you get no beeps with memory out check powersupply some PS's have a red switch on back for current input. switch back and fourth about 20 times uning a pen and set it to the right current for you location. put ram back in see if it will boot if not its trial and error of the PS and the CPU replacement and it still could be the RAM giving false readings. yea i know sounds like a ball of fun.
My recommendations would be to remove all connections to the board.
Remove the CMOS battery.
Remove the CPU fan and CPU.
Look at the top of the CPU, if you have a crust over the top of the CPU, you will need to remove it to a clean surface.
Next, your CPU fan should be a 3 wire connection on the motherboard, within two inchs of the CPU holder.
After cleaning the CPU, re-inseart and apply a heat sink lub for good heat transfer.
Re-install CPU fan and plug in to board connection.
Re-install your CMOS battery and power up unit.
With the CMOS battery removed, the time and date will need to be reset.
Also, in the BIOS for that board, you should be able to see temps. and rpm readings. ??
Hope the CPU has not taken a dump on you.!
Before you plug in the drives and other devices, check temps. rpm and voltages.
Have fun, hope this has helped you.
The four-pin CPU fan connector is the same as the three-pin (red is for voltage, black is ground and yellow for the rpm reading) but also adds a blue wire used by some BIOS sets to adjust the RPM speed of the fan. The three-pin will fit into a four-pin connector without modification, using a jumper is DEFINITELY not recommended as it could short your board.
If your system has the four-pin fan, and it boots and runs without error, it may be that your CPU is running cool enough that the fan is not needed at the time. Check your BIOS for a hardware monitor to see the actual CPU temperature. Also, you may have added utilities in Windows to give the fan speed and CPU temperature in real time. You may also notice the CPU fan kicking in when doing CPU intensive operations (virus scans, etc.)
The four-pin fan would run from a three-pin connector but would always run at full speed because the RPM Adjust signal is not present.
You may have a high end video card installed, which will need a big power supply.
Try removing all parts except the CPU and video card, your system should still boot to the bios post screen, If still no go try a new video card, cpu. you will need to keep swapping parts around tell you find out witch one is causing you the prob, its the only way to sort out a hard ware issue. Hope this helps Have a nice day.
If you have a PM-599LMR (M599LMR) motherboard or PG-5517A PreSystem you may not be able to update your BIOS. A batch of BIOS chips used on these motherboards was accidentally WRITE-PROTECTED when it was originally programmed. Any attempts to update the BIOS on one of these write-protected BIOS chips will cause the system to become unusable. The only way to restore your computer is with the original BIOS and the BIOS recovery procedure above.
Have you removed all memory, other cards and unhooked all other drives to see if a short exists there? With a 300W PS some other component may be pulling too much that the CPU can't start so it tells you the problem is with the CPU or The CPU its refering to is on the video card?
Unplug everything from the motherboard leaving only processor, fan and memory and try to boot up. It will take you to bios screen halt after looking for boot device. If it uses a video card, make sure video card is properly inserted.
Then start plugging in hard drive and other devices if system comes up.
Your computer has memory problems. First check the video. If video is working, you'll see an error message. If not, you have a parity error in your first 64K of memory. First check your SIMM's. Reseat them and reboot. If this doesn't do it, the memory chips may be bad or they are mismatched .The CAS latency has to be the same and compatible with your M/B. You can try switching the first and second banks memory chips. First banks are the memory banks that your CPU finds its first 64K of base memory in. You'll need to consult your manual to see which bank is first. If all your memory tests good, you probably need to buy another motherboard.