My computer will suddenly sound like an airplane taking off when I am using it and even when I am not. Had cooling fan replaced seemed ok for a day then started in again. Also it seems to freeze up alot causing the 2 green lights on the front to stay lit up. What should I do ?

Inderpal Singh

• 183 Answers
• Posted on Oct 26, 2008

SOURCE: lost power

unplug all the cables including power cable...
Then Press the Power button at the Front and hold it for 20 seconds
then connect the Power cable and monitor cable and turn your computer back on.
i am sure your computer is going to turn back on.

and if it doesnot turn on ask me again i can give you more help for the same as i am a Desktop Engg. and worked for HP and working for IBM now.

Thanks

SOURCE: Pc won't start

try to reset BIOS by CMOS battery from motherboard and insert again...if not worked then..ur motherboard needs to be replaced...

SOURCE: Loud fan noise

Some HP computers are known for video card fan noise. I had an a1250n and a m9500f with this problem. On the a1250n, they replaced the video card 4 times. HP finallt told me they know about this problem. I guess they had to keep giving inferior video cards until you got a good one. If it is under warranty get a free replacement from HP. If not, don't mess trying to fix it like putting special oil on the fan spindel which helps for a short while.

SOURCE: Same problem

I would try to replace the PSU and see if that makes your computer boot. Do like a guess and check. If its not the PSU, maybe try a new motherboard. Does the computer not boot, or does it beep when turned on? I hope this helps solve your problem

joecoolvette

• 5660 Answers
• Posted on Jul 31, 2010

SOURCE: When I push the startup button, the green light

hshorty,

When you press the plastic Power On button, it in turn presses against a Power On switch.
The Power On switch is located inside the plastic Power On button.

This is an example of a generic ATX Power On switch,

http://www.directron.com/atxswitch.html

The switch completes a circuit.
(The Power On switch is a Momentary Contact Switch. Makes a brief contact, then opens back up)

The circuit the Power On switch completes, is the 5 Volt Standby circuit.
When a Power Supply is plugged into power, there is a constant 5 Volts (DC) present.
Closing this 5 Volt Standby circuit, momentarily 'excites' the Power Supply, and turns the Power Supply on.

Power goes to the Motherboard, and Peripherals, (Harddrive, optical drive/s, and so on)
The first chip to receive power is the BIOS chip.
(Chip and Chipset are slang terms for I.C. Integrated Circuit)

The BIOS program on the BIOS chip, looks to see what devices are installed, does a Ram Memory count, TURNS the Processor on, and hands the computer over to the O/S.
(O/S = Operating System. Windows XP is one example of an O/S)

Your Power Supply doesn't even have enough power to light those LED lights, much less turn the Processor on.

A) ALL the LED lights together, use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts.

C) A typical Processor can use 51 to 125 Watts. Depends on what Processor it is. (Older Processors use less than 51 Watts)

If this problem is in reference to a Compaq Presario SR5130NX desktop computer, it comes with an Athlon 64 X2 - 3800+ Processor.

(Windsor Core. Also this Processor uses an AM2 processor socket)

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01048297&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=3436820

This Processor can use up to 89 Watts.

http://en.wikipedia.org/wiki/List_of_AMD_Athlon_64_microprocessors#.22Windsor.22_.28F2_.26_F3.2C_90_nm.29

Fans start to spin, and the LED power light is on for the Power Supply. When it's time to turn the Processor on, too much power is needed, and the Power Supply 'drops to it's knees'.

The Power Supply used is just a common ATX style of power supply. (Actually it is an ATX 12V 2.x)
Used in a LOT of personal computers out there, and is readily available.
It's a 300 Watt unit.

(The ATX form factor for this Power Supply, (Size and shape), is approximately 6 inches Long, 6 inches Wide, and 3-1/2 inches Tall)

Power cables from the Power Supply needed are;

A) 24-pin ATX main power cable (Main power cable to motherboard)

B) 4-pin ATX +12 Volt power cable, (Also known as P4)

C) At least one SATA power cable for the SATA harddrive, and additional SATA power cables, for each SATA optical drive.

(Your Presario may have come with SATA optical drive/s, or IDE {PATA} optical drive/s. Optical drive = CD/DVD drive)

D) If your Presario came with IDE, (Also known as PATA), optical drives, you'll need a standard 4-pin Peripheral power cable, for each drive.

E) The computer case fans, may each use a standard 4-pin Peripheral power cable. (The Processor fan attaches to the Motherboard)

F) The Memory Card Reader needs a Floppy Drive power cable. An auxiliary power cable.

An example of a compatible Power Supply,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4465483&CatId=1079

(Wasn't supposed to be stated as a Clarification)