Member Avatar for Nanci252

Gateway Zx6971-UB10P AIO appears to not be getting power, it comes on with logo and an overlay that says PC Mode in blue. also gives One short beep code, then immediately goes off and shows No Signal on monitor screen. Have tried a hard reset ( remove power and hold power button 30 sec.) no change. Also appears the tip of power cord wiggles in cord socket (back of unit). All peripherals are disconn., only functioning with mouse/keyboard attached. Cannot find an adequate disassembly schematic way user maunal will not download .

Thanks for any help in advance.
Nanci

Edited by Nanci252 because: forgot an item of importance
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A compact troubleshooting plan that builds on the ideas from and and is ordered from least-risk to most-invasive. The goal is to use quick tests to isolate whether the fault is the external adapter/cable, the AIO power/DC jack, or an internal power/regulation failure that only appears after POST.

  • Quick, non-invasive checks:

    • Verify the wall adapter voltage with a multimeter (match the label on the adapter). A steady, correct voltage with no drop when the plug is gently wiggled rules the adapter out.
    • Try a known-good adapter with the same voltage and polarity if available; a temporary fix with a snug-fitting plug or tape that stabilizes the plug indicates a worn jack/jacket connection.
    • Observe POST/beep behavior while removing boot devices: disconnect the internal drive(s) and try a minimal boot (CPU + one RAM stick + power). If the unit still powers down after POST, the problem is likely power delivery rather than the OS or HDD.

  • More-invasive checks for someone with experience:

    • After unplugging and discharging caps, open the back and inspect the power input board and mainboard for loose connector pins, cracked solder joints at the DC jack, bulging or leaking capacitors, or burn marks.
    • Reseat or swap RAM modules one at a time. Try shorting the front-panel power pins on the mainboard briefly to rule out a stuck/failed power switch board.
    • If available, bench-power the system with a regulated supply to monitor voltages under a stable load; rapid sag on a rail when the system hands control to the OS points to a failing regulator or power board.

Safety and next steps: mains-side work and LCD removal carry shock and damage risks; professional repair is recommended if experience is limited. If the DC jack/small power board is the culprit, those parts are commonly replaceable and cheaper than full-board swaps; record the Gateway model and any part numbers printed on the boards before ordering replacements.

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Member Avatar for BigPaw

Well, here's a Youtube vid' to get you started.

Member Avatar for Nanci252

Saw that already. Looking for more specific ideas as to Why ? or What causing it ?

Member Avatar for BigPaw

Cooling in some of these systems doesn't always pay too much attention to the video chipset. It may be that due to the nature of thermodynamics your video chipset loses connection after a brief warm up.

Or, as you have noticed, the loose power connecter either needs to be resoldered or replaced. The slightest jiggle, or again due to a brief warm up, may be disconnecting it from the power.

Member Avatar for gerbil

The Gateway's BIOS issues one short beep before passing control to the operating system. Overheating? I doubt that as the system has only run a low demand POST before closing down. Does POST show your hdd detection as correct, because loading from the system disk is the next step, and appears to be the one where it is falling down? Alternatively, you could enter the BIOS and see if the drive is listed.

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