Motherboard making Siren sound then shuts down and NO VIDEO!

[criminal666]

Hello I am going crazy! I have had my Pc for less then a year and 2 weeks ago the pc would run power through it and all seemed to be running however I had no video whatsoever and the power and reset buttons did not respond. I checked everything inside and all fans were running, hard drives, disk drives were fine. I tried a new video card and still did not work. I contacted intel and they had me try a few things non of which worked so they replaced the motherboard. I now have the same thing with the new motherboard. I removed my videocard and still no video. I also tried booting without ram and I first got the 3 beeps them it shut down. When I powered on again I got a siren sound and it shut down. I have no idea what is going on! Please help me out!

[Heartborne]

Wow, that sounds rough! Don't worry, we've all had similar problems. What kind of motherboard do you have? We have to determine what that siren sound means.
The 3 beeps without memory sounds right. In order to narrow down the problem we'll need to do some more troubleshooting. Give us the make and model of your motherboard, cpu, and video card. We'll troubleshoot from there. The make, model and wattage of your power supply might prove helpful as well.

[criminal666]

The motherboard is Intel D945GCCRL, the video card is PowerColor X1550, the CPU is Intel Pentium D 805 2.66Ghz DT 533FSB, the power supply is Power Up Standard 450w ATX Power Supply. Could it have something to do with the case? I dont know I am just at wits end and just landed a new job which I WILL need my pc! This sucks! thanks for all the help in advance!

[criminal666]

Also I figured I would say that now it does not make the siren sound! I dont know what the issue is. I dont know if I need a new processor fan? I could not get the fan to mount to the motherboard! I have just too many problems!

[criminal666]

It sounds like the powersupply is makin a funny noise when it first starts up. Could it be the power supply?

[YODA74]

Have you gone into the bios and see what the temp is and if the alarm is shut off? If it is on I would say it is heating up and warning you??

http://www.intel.com/support/motherboards/desktop/sb/CS-012552.htm#alerts

[criminal666]

I cannot get into the Bios since I have no video on the monitor:(

[Heartborne]

all right, that sounds like some obscure hardware... it makes it a little harder to pin down. When I have some more time, I will google it and see what I come up with. Who is the manufacturer of your pc? Have you tried giving them a call?
A bad power supply is definitely a possiblity. I recommend removing it and having it tested at a local computer store. If you're not comfortable removing it, you might want to bring them the whole computer but they'll most likely charge you for their time.
The siren-like sound also gives me the impression that the psu might be faulty, since I have heard electronic devices make similar sounds when they are on the way out.
Start with the power supply and see if we can figure out your problem from there. Have that one tested. Most technicians will tell you to replace your psu once per year.

[criminal666]

I bought a barebone kit and already have recieved a new motherboard. Any thoughts of it being the processor?

[Heartborne]

It's possible, but not likely. In my experience these issues have never been caused by a defective or damaged CPU. Your power supply is a more likley culprit.

[david eaton]

Usually a siren sound when you first turn on the power means an overheating processor. Is the heatsink/ fan installed properly?
If this was a retail processor/heatsink, was the protective filem removed before installation/
Is the fan plugged into the right header on the motherboard?

[criminal666]

Well processor fan could be a problem also. I know its plugged in properly it runs fine it just is not mounted onto the motherboard. Cheap fan I guess. I will probably get a new powersupply and CPU fan once I get some cash! I wish I was not broke right now!

[Heartborne]

whoah! Back up... it's not mounted on the motherboard?
We just found your problem. Your CPU is DEFINITELY overheating.

In order for a heatsink/fan to work properly, it has to be flush with the processor and mounted onto the board.
Kudos to David for recognizing the siren sound... I knew I had heard it before!

ALL CPU hsfs have to be mounted onto the motherboard. If they're not either it's not installed properly or it's the wrong fan. The fan that COMES with the cpu should mount directly to the board. The LGA 775 fan has four two-pronged plastic forks that pop directly into the four holes adjacent to the four corners of the CPU slot.

If that's not popped in, your cpu is going to overheat and your system will not boot. Period.

[Heartborne]

please watch this instructional video (http://www.youtube.com/watch?v=OFEOd7nQbuQ)

[criminal666]

Well I think I found out the problem. I finnaly opened up my power supply and one of the big capacitors is bulging out the top! Same thing that happen with my last PC's power supply. Could it be something I am doing wrong?

[Heartborne]

I don't know, I've never opened up a power supply before. Maybe it's defective? I would consult the manufacturer, but since you opened up the PSU... you voided your warranty.
Anyway, the cpu hsf should be locked onto the board. If it's not, your cpu is definitely overheating.

[david eaton]

I finnaly opened up my power supply and one of the big capacitors is bulging out the top!
Not only have you voided the warranty, but you ran a serious risk of a lethal shock! The capacitors in a PSU can hold a charge for several days, and at up to about 400Volts, they are not things to take lightly!
Not sure if you are doing something wrong, but I would start out by checking the mains supply for spikes and surges. Are you using a UPS? or a surge protector?