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what the problem is with my pc.....when i newly made it, it was running fine but now it is not switching on normally.....the problem is that when i switch it ON after 5 seconds a tick souds come and then after a while a long beep and their is no display on the screen....then i switc it off and after 4 or 5 time it starts..but the windows is runnig fine.....my specification is
MSI mainboard K8N neo plantinium
AMD athlon 64 3000+
DDR 400 2x512 mb kingston
gforce 6600 256mb MSI

help and in core centre the voltages are also going up and down on their own....

An educated guess, check your PSU is not borked.  ;)

what the problem is with my pc.....when i newly made it, it was running fine but now it is not switching on normally.....the problem is that when i switch it ON after 5 seconds a tick souds come and then after a while a long beep and their is no display on the screen....then i switc it off and after 4 or 5 time it starts..but the windows is runnig fine.....my specification is
MSI mainboard K8N neo plantinium
AMD athlon 64 3000+
DDR 400 2x512 mb kingston
gforce 6600 256mb MSI

help and in core centre the voltages are also going up and down on their own....

I see a couple of major concerns. 1st, the core voltage flux... NOT normal, second, the "ticking sounds". If they are rapid ticks, then the beep, followed by black screen and lock up, this indicates a buffer overflow issue in CMOS (IE keyboard buffer overflow). Regardless of cause, both these symptoms indicate hardware issues.  

Check your CMOS settings and make sure your video is set up correctly first, then set everything in CMOS to Auto or default and see if this clears up the problem.

If not, try checking for BIOS update at MSI for your OS. These symptoms could also be caused by extreme overheating. Check that as well.  Hope this helps.

Mick

ok i will check it and then informs you...ok thanks

no the problem have not solved....but the pc starts when i slide the whole pc upside down....but when i restars from windows it again lock up.....i have seen in bios setting the voltages are continuosly moving up and down...is this the problem with power supply???????i have 400W power supply

You might have some power saving software like Cool & Quiet that is causing the voltage fluctuations, only you could know that.

What are the fluctuations? Mine has been just starting to fluctuate in the last day or so, but it ain't crashing.

1.4v to 1.42 volts for instance is about the fluctuation I'm getting.

1 long beep is an error code, check your manual.

The loud tick is probably your monitor turning on.

This could be a loose or improperly fitted ram module or video card, they are touchy, carefully remove them and insert them carefully back in again.

no congo i have tried it...i cleaned the cpu...re assemple the ram and vga...the problem remains the same...the tick sound is not of monitor ...it is coming from inside the case....i am trying to hear it...from where it coming...but fails..now what i do..

This site is a good source of MSI information and diagnostics:

http://forum.msi.com.tw/

It is not owned by MSI or run by MSI... the people there are quite good at MSI based problems. Check out the FAQ for your motherboard and post your problem(s) if you do not see any resolved issues in the FAQ.

It does sound like a PSU issue. Are you sure all the PSU leads are properly connected? Do you have another power supply you could use to test with?

what the problem is with my pc.....when i newly made it, it was running fine...

This got me thinking about another (possible) issue. You state that you built your system yourself? If this is so, I would wonder if maybe your having an issue I have personally experienced. And not just me, most ANY licensed system builder has done this a time or two when in a hurry etc.. Especially if you've built less than 50 systems.

Make absolutely sure you haven't added any standoffs that don't have corresponding holes. This is easier to do than you might think when aligning a board and setting the standoffs prior to assembly. Usually, if this is the case, the unit won't boot at all (direct short), but I've seen systems work with a shorted standoff and then mysteriously "quit" post burn in. Also be absolutely sure you didn't leave any extra screws between the mainboard and chassis (A good shake of the case will usually tell this one).

Boards microsopically "settle in" with heat cool cycles, so this problem is not as uncommon as it might appear. I suggest, follow Nick N's advice and check your Power Supply, if its good, then you might consider checking for orphaned stand off's in the chassis. Other than that, you might need to take it in for a checkup. Could be a bad mainboard, mem / chipset, or CPU causing these issues as well..
Regardless, this is definitely hardware (IMHO)  :)

Wish you the best of luck and a speedy resolution
Mick

... also make sure the 4 pin power connector is secure on the motherboard. I recall there were some issues with MSI motherboards and that connector being forgotten or somehow worked its way loose.