Dell OptiPlex 790 Repair & Upgrade Specialists
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The Dell OptiPlex 790 is a solid machine and we keep them running. From no-power and boot faults to storage failure (with data recovery) and SSD/RAM upgrades, we repair and modernise the Dell OptiPlex 790 across Australia — with honest advice on what’s worth it.
Fast, honest Dell OptiPlex 790 repair & upgrades — no fix, no fee.
✔ No fix, no fee · ✔ 90-day warranty · ✔ Onsite, remote & workshop · ✔ Since 2001
Common Dell OptiPlex 790 Faults We Repair
- Won’t turn on / amber or blinking power light
- Won’t boot, no POST or beep-code errors
- No display / no signal on boot
- Hard drive / SSD failure or bad sectors (with data recovery)
- Slow performance — SSD & RAM upgrade to extend its life
- Overheating, dust-clogged or noisy fans
- Failing power supply or swollen capacitors
- Won’t connect to Wi-Fi or the internet
- BIOS / CMOS battery & boot issues
- Windows won’t boot, or upgrade to Windows 10/11
About the Dell OptiPlex 790
We repair and upgrade every Dell OptiPlex 790 — power, motherboard and PSU faults, swollen capacitors, ageing hard drives (with full data recovery), memory and cooling. A quality SSD, a RAM bump and a clean Windows 10 or 11 install can make it feel new for a fraction of replacement cost. Genuine, OEM-spec and quality refurbished parts; out-of-warranty and end-of-life fleet units welcome.
Our Repair Process
1. Free phone or Quick Quote triage. 2. Diagnostic — we pinpoint the exact fault. 3. Upfront fixed quote — no fix, no fee. 4. Repair or upgrade with quality parts and a 90-day warranty. Onsite, remote or in our workshop, Australia-wide.
Why The Original PC Doctor
- Since 2001 — 24+ years repairing Australian computers
- No fix, no fee diagnostics
- 90-day warranty on parts and labour
- Onsite, remote & workshop options
- Genuine, OEM-spec & quality refurbished parts
- 1,300+ verified customer reviews
Get your Dell OptiPlex 790 repaired or upgraded — talk to a technician now.
✔ No fix, no fee · ✔ 90-day warranty · ✔ Onsite, remote & workshop · ✔ Since 2001
Dell OptiPlex 790 Repair FAQs
How much does a Dell OptiPlex 790 repair or upgrade cost?
Every job starts with a free, no-obligation Quick Quote and an upfront fixed price. No fix, no fee, with a 90-day warranty — and we’ll tell you honestly whether a repair or an SSD/RAM upgrade is better value.
Can you recover data from a Dell OptiPlex 790?
Yes — we recover documents, photos and files from a Dell OptiPlex 790 even if it won’t boot, and can move them to a new SSD or PC.
Why won’t my Dell OptiPlex 790 turn on?
Usually a failing power supply, swollen motherboard capacitors, a flat CMOS battery or a power-button fault — all commonly repairable. We diagnose it free and quote upfront.
Is it worth repairing or upgrading my Dell OptiPlex 790?
Often yes — an SSD, a RAM bump and a clean Windows install can make it feel new for a fraction of a replacement; we give honest advice if it isn’t.
Do you repair the Dell OptiPlex 790 out of warranty?
Absolutely — out-of-warranty and end-of-life machines are our specialty; we’re independent.
Where can you repair my Dell OptiPlex 790?
Australia-wide — onsite, remote, and workshop with nationwide pickup. Call 1300 723 628 or use the Quick Quote.
Related: Dell Desktop Repair · Desktop PC Repair · Data Recovery
Free Resources
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Dell OptiPlex 790 Repair faults we repair every week
Power supply failure
Symptom: No power or amber blinking power light on the front panel
How we fix it: Technicians replace the 275W or 300W internal Dell PSU with a matching OEM or quality refurbished unit and test the 24-pin and 4-pin connectors under load.
Repair or replace? repair
Swollen capacitors on motherboard
Symptom: Random shutdowns, boot failures or POST errors after the machine has been in service for eight-plus years
How we fix it: Board is removed, bulging electrolytic capacitors around the CPU VRM and chipset are desoldered and replaced with low-ESR equivalents before reflow and full functional test.
Repair or replace? Depends
Failing 3.5-inch HDD
Symptom: Clicking noises, SMART errors and inability to boot or access data
How we fix it: Drive is cloned to a new 2.5-inch or M.2 SATA SSD using a hardware duplicator, Windows is reinstalled or the original image restored, and the old drive is securely wiped.
Repair or replace? repair
CMOS battery failure
Symptom: BIOS resets on every power cycle, incorrect date/time and boot device order lost
How we fix it: CR2032 coin cell is replaced on the motherboard and BIOS settings are reconfigured or updated to the latest Dell A21 or A22 revision.
Repair or replace? repair
Overheating from dust-clogged heatsink and fans
Symptom: Thermal throttling, loud fan noise and sudden shutdowns during extended use
How we fix it: Case is opened, CPU and PSU heatsinks are removed, compressed air and isopropyl alcohol clean all fins and fans, thermal paste is replaced and fan bearings checked.
Repair or replace? repair
Dell OptiPlex 790 Repair price guide
| Repair | Indicative price | Typical turnaround |
|---|---|---|
| Power supply replacement | $145-$195 | Same or next business day |
| Motherboard capacitor repair | $260-$340 | 2-4 business days |
| HDD to SSD migration with data recovery | $185-$265 | Same or next business day |
| CMOS battery replacement & BIOS update | from $89 | Same day |
| Full clean, thermal paste & fan service | $120-$160 | Same day |
| 8 GB DDR3 RAM upgrade | from $95 | Same day |
| Windows 10/11 clean install & optimisation | $130-$175 | Same or next business day |
Prices are indicative only — every job is confirmed with a free, no-obligation quote after diagnosis. No Fix, No Fee.
Dell OptiPlex 790 Repair — your questions answered
How much does it cost to repair a Dell OptiPlex 790 that won't turn on?
A no-power OptiPlex 790 is most often fixed by replacing the internal 275 W or 300 W power supply. Technicians quote $145-$195 for parts and labour with same-day turnaround in most capital cities. The machine is tested under load before return and carries a 90-day warranty.
Can you recover data from a clicking hard drive in an OptiPlex 790?
Yes. The drive is cloned in our workshop using hardware duplicators to avoid further damage. Data is transferred to a new SSD and the original drive is wiped. Typical cost ranges from $185-$265 depending on drive condition and data volume.
Is it worth upgrading an OptiPlex 790 to Windows 11?
The 790 meets Windows 11 requirements once a TPM 2.0 module is enabled in BIOS and an SSD plus 8 GB RAM are fitted. A clean install plus hardware refresh usually costs $225-$320 and can give the machine several more years of service.
Why does my OptiPlex 790 keep resetting the date and time?
The CR2032 CMOS battery on the motherboard has failed after roughly seven to ten years. Replacement takes minutes and costs from $89 including BIOS checks. The machine retains correct settings after the new battery is fitted.
How long does a full service and SSD upgrade take on a Dell OptiPlex 790?
A complete clean, new thermal paste, fan check and SSD migration is usually completed the same business day when booked before midday. Turnaround is confirmed at the time of the free quote.
