System hanging/freezing in DOS

Over the last several months, my father's Win95 (OSR2) system has been freezing up more and more frequently, with no recourse other than the reset button. (Prior to that, it had run for a year or so with no problems.) At first it happened only once or twice per day, and I suspected software, since he had recently installed McAfee Office. But after removing all traces of McAfee, the hangs continued. They seemed to be uncorrelated with whatever was running or being done on his system. They grew more frequent, up to 10-12 times per day. So a few days ago, I took it on myself to perform a clean installation of Win95.

While I was fiddling around in DOS, preparing to reformat his C: drive and so forth, the system hung again. I was able to reproduce the hang pretty reliably (although not every time), just by using the EDIT command on a simple .TXT file and pressing the Page Up/Down keys several times in quick succession. Now thinking it might be a problem with DOS itself, I booted his system into DOS using a startup disk created on my own Win95 OSR2 system (with no extraneous drivers or TSRs in memory). Alas, the hangs continued. So now I began to suspect hardware.

We have installed a new mouse and keyboard, and I've deinstalled all add-in cards except his video card. This has relieved the symptoms, but I have still gotten his system to hang by editing a simple text file (and at least once by just leaving the system idle at the C: prompt). The remaining hardware is:

- Amptron PII-2000 motherboard with an AMI BIOS
- Pentium II 266MHz CPU
- 64MB SDRAM memory
- Diamond FireGL Pro 1000 AGP video card
- two hard drives: a 5.7GB Maxtor drive and a 6.4 Western Digital drive
- a Digital Research 40x CD-ROM
- an Acer 4x4x32 CD-RW drive (removing this drive didn't seem to help)

By process of elimination, it seems as though the problem must be something on the motherboard (e.g., the IDE controller), the CPU itself, or memory. How can I troubleshoot these components, or do we just have to spend the money to replace them on a trial and error basis?
drlivingstonAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

jj_makoCommented:
i would suspect memory first.  do you have any diagnostic software, like qaplus?  see if you can get ahold of some software to check your memory.
0
s_turner99Commented:
It doesn't hurt to remove & reinstall every cable and memory stick on the motherboard.  This can alleviate an intermittent connection problem.
0
drlivingstonAuthor Commented:
I ran all of the memory tests using an old version of AMIDIAG (4.50), and it found nothing wrong with the memory.
0
10 Tips to Protect Your Business from Ransomware

Did you know that ransomware is the most widespread, destructive malware in the world today? It accounts for 39% of all security breaches, with ransomware gangsters projected to make $11.5B in profits from online extortion by 2019.

joedCommented:
Are all the fans running. Is there a thick layer of dust covering all the components and inside the power supply. Could be overheating and the chips could be permanently damaged. It now takes less heat to kill them.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
mikecrCommented:
I have to agree that this is either a memory problem or possibly heat related.

0
drlivingstonAuthor Commented:
There was some dust inside the case but nothing too excessive. I don't think it's heat-related; all of the hangs (except for one time it hung at the C: prompt) were associated with specific keyboard (in DOS) or mouse actions (in Windows). Generally, if I'm in DOS and just typing a command line at regular speed, or executing most commands (e.g., TYPE, MEM) there's no hang. The only reliable way I've found to get it to hang is to EDIT a file and then page up and down quickly. (There may be other ways, too; I just haven't explored for others since this one "works" pretty reliably.)
0
deondCommented:
In the bios you can change the typmatic speed to see if it might be a bios problem

hope this helps
0
drlivingstonAuthor Commented:
Well, if it were a snake it would have bit me...it looks like joed's suggestion was on the mark; the fan wasn't working any more. No wonder the system behavior was so erratic. I'll be replacing the fan tomorrow morning; hopefully no significant damage has been done (other than the long hours I've put in troubleshooting this one).
0
joedCommented:
Was it the processor fan or the power supply fan?
0
drlivingstonAuthor Commented:
It was the processor fan - plain as day, except I just didn't notice it. I replaced it this morning and everything is back to normal. Thanks for your suggestion - and thanks to everyone else for their helpful comments as well.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Hardware

From novice to tech pro — start learning today.