For OS5 & W(windows) series NAS: (For OS7 Intel X86 NAS with HDMI/VGA model, please scroll down) Please power off NAS eject HDD & SATA DOM, arrange memtest86+ to verify memory compatibility & system stability, with following steps:
A-1. Make MEMTEST86+ driver
Method1: (newer version) M1-1 Create from Windows 9x/2K/xp/7, download and execute from your PC and would clean USB driver up and install this tool & bootable: http://www.memtest.org/download/5.01/memtest86+-5.01.usb.installer.zip
Method2: Traditional DOS boot M2-1: We need prepare an USB driver as a Free DOS bootable disk from: http://rufus.akeo.ie/ or https://github.com/downloads/pbatard/rufus/rufus_v1.1.7f.exe M2-2: Copy memtest86+-4.20.exe.zip and unzip the MT420.EXE into USB driver. http://www.memtest.org/download/4.20/memtest86+-4.20.exe.zip
A-3. Plug USB driver into NAS back panel USB2.0 port, and USB keyboard. A-4. Power up NAS & N2800/N4800/N5550/N7510/N4510U & press F2 into BIOS. (N2810, N4810, N5810 press DEL) A-5. Config BIOS boot menu booting from USB driver. A-6. Boot into DOS, type "MT420.EXE" for memory testing at least 24~48 hours.
B. Since enter the MEMTEST86 and system would auto start testing, as like following link picture, the top line have PASS & TEST running, and at middle left the WALLTIME is running, if get error would could found from middle-right the ERRORS & ECC ERRS.
http://www.memtest.org/pics/i875-big.gif
C. If MEMTEST doesn't running automatically, please help us doing compare test from an normal PC/NB to confirm the USB driver & MEMTEST is correct. C-1. Take this USB driver into a normal PC/NB, boot from USB and doing MEMTEST 86 testing, to confirm this USB driver & MEMTEST 86 is working. C-2. Remove the additional memory from NAS and doing the MEMTEST again.
For OS7 Intel X86 NAS with HDMI/VGA model:
1. Power NAS OFF. 2. Eject HDDs out with order. 3. Link NAS to monitor with HDMI/VGA & USB keyboard. 4. Press power button make NAS up and wait: BIOS post screen disappear or 12~15 second (ex: N2810, N4810 15 sec & N5810 12sec) 5. Press ESC key. 6. Should have following screen show up and choose Memtest86+. 7. If without menu to choose Memtest86+, please restart from steps 1 and extent longer second until following screen.

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