Member Avatar for mmmmary

Not a problem I have had before. When booting up, I get two short beeps and the computer asks I either check RAM F5 (did full tests and all tests come up fine), continue with F1 or do F12 for set up. I have tried all and am unable to find anything wrong.

The two beeps started about three weeks ago. Just before the two short beeps started happening upon boot up, I was getting one long beep for about a month prior.

A week ago, I was unable to get it to boot at all and ended up reinstalling the OS, which worked fine for a few days when it started with the two beeps again. Now we are back to the computer asking I either check RAM F5, continue with F1 or do F12 for set up before it fully boots. Hitting F1 booted it up fine...or so it seems until I shut down and have to turn it back on again.

I have reseated the RAM, checked for tight fits on all hard ware. Replaced the video card 6 months ago. Fan works strong and I made sure it was dust free. Did discover the sata cable for the hard drive was bad and replaced when I did the reinstall of the OS. Computer is not quite two years old. XPS 420 Dell with Vista 32 bit and up to date on all updates. Any suggestions?

  • 2 Contributors
  • 5 Replies
  • 356 Views
  • 14 Hours Discussion Span
  • Latest Post Latest Post by Chaky

Dani AI

Generated

A focused summary tied to the thread: the XPS 420’s POST beeps most often point to memory or video-initialization problems rather than Windows itself. The official XPS 420 Owner’s Manual lists memory-related POST/beep patterns and instructs reseating modules and running Dell Diagnostics when those codes appear. Because the XPS 420 motherboard does not have integrated graphics, video-related POST codes implicate the discrete GPU, its slot, or the board’s video-path—beep meanings vary by BIOS so record the exact pattern you hear. (manualowl.com)

Practical, prioritized checks (quick triage that builds on ’s suggestions): 1) do a close visual inspection of the system board and PSU for bulging or leaking electrolytic capacitors and scorch marks; aged caps and PSUs commonly produce intermittent POST/beep symptoms. 2) verify PSU rail voltages with a multimeter or PSU-tester (ATX tolerances are approximately +12V ±5%, +5V ±5%, +3.3V ±5%); if rails wander or fall outside those ranges under simple load, try a known-good PSU swap. Those two checks will quickly eliminate the two biggest causes on older XPS systems. (blog.silverpc.hu)

Memory-focused isolation (given that new Dell RAM was installed): run the Dell pre-boot diagnostics and then perform a minimal-boot routine while cold (power off long enough to reproduce the “cold fault” some users report): clear CMOS, boot with a single known-good DIMM in one slot, test the same DIMM in each slot, and repeat with the other DIMM(s). Intermittent “passes” from the diagnostics do not rule out a failing slot, failing memory controller, or intermittent PSU problem. (manualowl.com)

Next realistic steps: capture the exact beep pattern and any Dell diagnostic ID, try a known-good PSU (or have a shop load-test the original), and inspect for bad caps. If PSU replacement and slot-by-slot RAM testing do not resolve the fault, the system board (or its power circuitry) is the likely culprit; weigh motherboard repair/replacement cost against upgrading the system. Run and save extended Dell Diagnostics (F12) and give those codes to a technician for a faster repair decision. (dell.com)

Recommended Answers

All 5 Replies

Member Avatar for Chaky

Looks like:

a) RAM timings are wrong (maybe RAM or CPU is overclocked?)
b) PSU isn't producing enough juice (check voltages in BIOS)
c) RAM needs replacing (try one stick at the time, or different slots)
d) BIOS needs updating (only if RAM is brand-new and not on the Dell's aprooved list)

Member Avatar for mmmmary

Looks like:

a) RAM timings are wrong (maybe RAM or CPU is overclocked?)
b) PSU isn't producing enough juice (check voltages in BIOS)
c) RAM needs replacing (try one stick at the time, or different slots)
d) BIOS needs updating (only if RAM is brand-new and not on the Dell's aprooved list)

Thank you! A couple questions:
a) How do I tell if it is overclocked and how do I check the timing?
b) What voltage should it be running at?
c) Bought new Dell RAM and replaced.
d) checked bios with Dell and it is what its supposed to be.

~~Mary

Member Avatar for Chaky

a) If you haven't tempered with FSB frequency and multipliers (and no one else did, including some performance-tuning utility) , then there is nothing you can do, except revert to defaults in BIOS.
b) The default voltage depends on RAM model. I suggest that you use some voltage-monitoring tool like HWMonitor. You can test-drive by running some 3D power-hungry game while HWMonitor is running. It will record low-points and high-points of your voltages. They shouldn't oscillate at all (unlike temperatures).
Consider this some sort of PSU test. If the voltages oscillate, then PSU's power capacity is definitely impaired.
c) If the RAM is checked, then the problem lies with some other component. Second in line is motherboard (followed by CPU and PSU).
d) (this one is exhausted)

Member Avatar for mmmmary

a) If you haven't tempered with FSB frequency and multipliers (and no one else did, including some performance-tuning utility) , then there is nothing you can do, except revert to defaults in BIOS.
b) The default voltage depends on RAM model. I suggest that you use some voltage-monitoring tool like HWMonitor. You can test-drive by running some 3D power-hungry game while HWMonitor is running. It will record low-points and high-points of your voltages. They shouldn't oscillate at all (unlike temperatures).
Consider this some sort of PSU test. If the voltages oscillate, then PSU's power capacity is definitely impaired.
c) If the RAM is checked, then the problem lies with some other component. Second in line is motherboard (followed by CPU and PSU).
d) (this one is exhausted)

Thanks Chalky! Will go try these!

Member Avatar for Chaky

You welcome.

(BTW, it's Chaky)

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.