Solved

Unusual hardware problems

Posted on 1997-07-06
5
249 Views
Last Modified: 2010-04-12
A few months ago, my computer started freezing up completely for no apparent reason. It happened originally in Microsoft setup programs in Win95, and in Word97 in NT4, and on boot up in Linux.
After several days of trying to solve this, I disabled the CPU internal cache in BIOS. The system no longer crashed, but ran like a 486 (It's a P150 with Gigabyte HX motherboard, Grafixstar 600 and 32MB RAM). I then sent the CPU away for replacement, thinking the cause to be a broken cache. The replacement did the same thing.

The next thing was to UNDER-clock the CPU to a P120, thinking that if going slower made it work then this might be a good test. It does work now, but at P120 speed, and with occasional lockups in:
Carmageddon demo
Duke3D and Blood setup
Doom won't start in Win95

Also, I bought a new modem yesterday. It's one that takes processing power from the CPU, so is about half the price. It works fine on a friends machine, but on mine, when I boot up with it in, the screen stays blank, with not even the monitor power light on. The system does the self check and then stops, from what I can tell from the disk noise.

As it stands, the system is usable, but slower than I'd like, and with some irritating habits. And I can't use my brand new 33.6K modem either, so help would be much appreciated.
Thanks
0
Comment
Question by:jhubbard
  • 3
  • 2
5 Comments
 
LVL 4

Accepted Solution

by:
henrie earned 250 total points
ID: 1010531
Your system improved by lowering your busspeed (66-60MHz). This could identify one of your controllers isn't functioning properly anymore. Also mem acces and other speeds are lowered.
Adding your modem and after that not being possible to boot, certainly says something about your busspeed settings or a load to high on your databus.
You'll have to check your BUS-timings set in your BIOS.
What happens when you only install 16MB of RAM?
Disabling internal cache does influence your secundary cache. What happened when you disabled secundary cache?

What once was a working system and now is unstable, also could point out to a defective power supply (also when we keep in mind modems use several supply lines with different voltage)

0
 

Author Comment

by:jhubbard
ID: 1010532
I bought a new case about a month ago, so there's a new power supply in it since it first went wrong. I tried disabling the external cache, which didn't make a difference. I also tried a cache checker program, which showed up no faults.
I tried my memory in someone elses machine, and it worked fine. Also, isn't going from 150 to 120 a matter of the clock multiplier, rather than bus speed? I don't know that much about it, but multiplying in my head gives this answer. Could my multiplier chip on the MB be broken, if there is such a thing?
I can't remember if I tried altering the bus speeds, but I'll certainly give it another try.
Thanks
0
 

Author Comment

by:jhubbard
ID: 1010533
Well, I tried the bus timings and other options (they're the ones that go 222/333 and such, right?), and still no joy.

One thing, I already have a modem (14.4, which is why the new one), and that works fine. The difference between the 2 is that the new one uses the CPU.
0
 
LVL 4

Expert Comment

by:henrie
ID: 1010534
You are right about the multiplier, I was thinking you lowered from 133 to 120 MHz, which means the same multiply, but another clockspeed. When I reread your question, I saw that is was 150 to 120MHz, so you have indeed the same clock as before (60MHz).
So when the rest of your system is the same, and lowering your CPU-speed gives more stability, it must indicate a problem with DMA, mem i/o peripherals or an unstable CPU Voltage Regulator Module, all present on your M/B.
I think we've run out of options here and it looks like the only option is replacement of your M/B :(
0
 

Author Comment

by:jhubbard
ID: 1010535
Thanks Henrie, I'll take it up with my MB supplier.
0

Featured Post

Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Laptop keyboard tester 10 92
Noisy or bad lifters 7 76
Accessing WinXp drive on Win10: access denied 7 106
hp laptop model 10 42
Does your iMac really need a hardware upgrade? Will upgrading RAM speed-up your computer? If yes, then how can you proceed? Upgrading RAM in your iMac is not as simple as it may seem. This article will help you in getting and installing right RA…
What do we know about Legacy Video Conferencing? - Full IT support needed! - Complicated systems at outrageous prices! - Intense training required! Highfive believes we need to embrace a new alternative.
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question