No display no beeps but cpu is fine,power led is on and fans are running
When i power up, the led comes on and cpu and chasis fans start running but theres no display on monitor.
when i remove memory card and power up, there are beeps.
when i put memory back, no display
what seem to be the problem?
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As you have checked all of the removable components. That only leaves one bit left. The motherboard. Check the capacitors around the CPU socket and the Power connector. There is a common problem with Socket 775 CPU it is that the contacts on the CPU socket can be badly connected even when the CPU is fitted and locked in.
Power light possible means nothing, maybe a burned out led. No display: Try feeling the cpu heatsink to see if its getting warm. If it is cold after 15 minutes running, the CPU may have failed. If warm, move onto the graphics. If using onboard, try using an aGP card and see if you get a display then.
(I'm assuming that you get a beep on powering up? If you get no beeps at all, confirms CPU is at fault, if 8 beeps on start up, probably graphics. any other beep codes, post them and I (or somebody else will help)
As you say has become red and no power to the hard disk. First check the power cable for any loose connections and check if it give power to the cpu and the fan placed on processor starts working as you start the power. If fan it starts and with in few seconds stops then your power supply/SMPS is weak or damage. So replace it for proper working of your computer. And if after power on all fines but red led on monitor and no power to hard disk Try to replace the hard disk power cables because they are not working because of it no operating system is detected and led of monitor is red. After replacing hard disk cables hard disk starts working and still no display or red led on monitor check the vga cable for loose connection or replace it.If you are using vga display from graphic card try to get display first from onboard vga slot.After it your problem will disappear and your pc run smooth and fine.
If all the parts of your computers are fined functioning. This is a CPU problem witch is no display. Try to disassemble the CPU remove the heat sink the CPU and clean and insert it again. When you are now inserting the CPU be sure that you will put a thermal past in the heat sink so that the heat from the CPU are absorbed. If the heat will not be absorbed it will cause overheating.
The problem is the board on the case's display. It has temp alarms for your components(video card, hdd, cpu), there are temp probes for you to set so you can monitor these temps. However the board that controls these functions, or at least mine and many others I have read about, is defective. It will change display constantly and sometimes have garbage display. It is setting its own limits for what is considered a hi temperature. The limit it has set for one of your components is < room temperature so it thinks you are having an overheating problem. You can manually set the limit for overheat and it will fix it for a while, but it will prob happen again.
different beeping patterns are codes which indicate what part of the hardware has failed (ram, video card, cpu, ect). the fan failure would not cause beeps, and would not cause the cpu to fail unless already in windows. if you could find out the manufacturer of your motherboard you could check with them about what the paticular pattern of beeps which you are getting mean.
When a power supply goes out the way yours did, it's going to fry the MB 99% of the time. So you're going to need a new MB. It's possible that you CPU is ok, but that could also go too. I would replace the MB first, then the CPU if that doesn't work.