We help IT Professionals succeed at work.

Computer won't POST

yookz
yookz asked
on
211 Views
Last Modified: 2010-04-26
First, here are the possibly relevant hardware details:

HP Pavilion 7960
Pentium 4 1.3 MHz
Intel i850E Chipset
384 MB RDRAM
350W Antec ATX12V Power Supply
Geforce FX 5200 256MB
Award Modular BIOS v6.0

Computer is around 3 years old.

For months now, I've had this strange problem. Whenever I shut off or restart the PC, and tried to turn it back on, the power would come on, but the computer would not boot.  All the fans spin and the CD-RW, DVD, and hard drives would spin a little, but I'd get no display and no beep.  But after several hours, and in some cases, days, it would eventually boot up, and everything would work perfectly.


I've tried:

-Removing everything except the PS and CPU, hoping to at least get those memory error beeps, but nothing, just spinning fans. I tried removing the CPU as well, but nothing (can a motherboard even POST without a CPU?).

-A new power supply. I was sure this would solve the problem. The old power supply was way too weak (150W, and my Geforce requires at least 250W) and when I looked inside it, sure enough, there was dried orange goop all over the capacitors. But after getting a new one, I still had the same problem.

-Clearing the CMOs

-Reseating the memory, CPU, graphics card and sound card

-Checked for burn marks on the memory and CPU, but they don't look fried. (but something does smell kinda burnt in the case)



I'm guessing the problem lies in my motherboard or CPU, but what really confuses me is the fact that when the computer does boot up, everything works perfectly fine.
What would make my computer only boot up sometimes?

I really want a professional opinion before I go getting a new motherboard or CPU, so any suggestions/insights/guesses at all would be greatly appreciated.. thanks.


-Jay
Comment
Watch Question

CERTIFIED EXPERT
Top Expert 2012

Commented:
It very well might be your motherboard, and since it's 3 years old, there are a lot of relatively old parts in there.  Before you come to that conclusion, check out the other possible causes.  First, just like you thought, my initial impression was that there was not enough power.  You got a new power supply, but do you know if that supplies enough power?  You can test this theory by removing everything you can that presents a load at boot time - the hard disk and cdrom, all PCI cards, everything except the video card, cpu, and one stick of RAM.  Boot it up repeatedly and see if the problem is still there.  If it is, it is not likely the power supply, but not completely eliminated because the old power supply could have had a problem and the new one is an unknown - you need to test against a known good component.  By the way, what did you replace the Antec with?  Antec, next to Enermax, makes pretty good power supplies.

Try a different video card - a bad video card can prevent booting.

A bad hard disk connection can prevent booting.

Look carefully at your motherboard for bad capacitors there.  That would give power problems.

Author

Commented:
The Antec 350W is the new power supply. The old one was some generic 150W PS. I think 350W is plenty of power for my system..

And I didn't see any swollen/leaky capacitors on the motherboard.
CERTIFIED EXPERT
Top Expert 2012
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.